The Basic Riff and Tuning

"Can't Stop" uses standard tuning (E-A-D-G-B-E from lowest to highest string), so you do not need to retune. The song is built around a single repeating riff that sits mostly on the lower strings and uses a mix of open strings and fretted notes. The riff is in the key of E and repeats throughout the entire song—there is no chorus riff or bridge riff to learn separately.

The main riff starts on the low E string (the thickest string). You will play the 7th fret, then move to the A string and play the 7th fret there as well. From there, the pattern shifts to the D string (7th fret) and then the G string (8th fret). The riff then returns to the low E string at the 7th fret and repeats. This four-note sequence is the foundation of the entire song.

Key Takeaways

  • The main riff uses only the four lowest strings (E, A, D, G) and repeats the same pattern throughout the song.
  • You play mostly on the 7th and 8th frets, making this riff accessible for intermediate players who are comfortable with barre chords and fret navigation.
  • The riff has a syncopated rhythm with some notes held longer than others, so counting carefully and listening to the original recording is essential to getting the timing right.
  • The lead guitar parts that play over the riff use pentatonic scales and require faster finger movement, but the rhythm part is the foundation you should master first.

Playing the Riff Step by Step

Start by placing your index finger on the 7th fret of the low E string. Play that note and let it ring for one beat. Move your finger to the 7th fret of the A string (the second-thickest string) and play it. This note also rings for one beat. Next, move to the D string and play the 7th fret, again holding it for one beat.

Now shift to the G string and play the 8th fret—this is the only note in the pattern that sits on a different fret number. Hold it for one beat. Return to the low E string and play the 7th fret again. This completes one cycle of the riff. The entire pattern takes about four beats to play, and then it repeats from the beginning.

The tricky part is the rhythm. The notes are not evenly spaced—some are played quickly in succession, while others are held longer. Listen to the original recording and count along with the beat. The riff sits slightly behind the drum kick, which gives it a laid-back feel. If you rush the notes or play them too evenly, it will not sound right. Slow down the song using a music app or YouTube's playback speed feature, and practice matching the exact timing before you try to play at full speed.

Common Mistakes to Avoid

The most common error is muting the strings too early. When you move from one string to the next, your finger naturally dampens the previous string. In "Can't Stop," you want each note to ring out and overlap slightly with the next one. Do not lift your finger off the fretboard between notes—instead, slide your finger along the strings as you move from one to the next. This keeps the notes connected and gives the riff its smooth, flowing sound.

Another mistake is playing the riff too fast. Many players hear the energy in the song and try to speed up. The actual tempo is moderate—around 100 to 110 beats per minute. Use a metronome set to this speed and practice the riff until you can play it cleanly without thinking about where your fingers go. Once the muscle memory is solid, the riff will feel natural at full speed.

A third error is not muting the strings you are not playing. When your finger is on the 7th fret of the low E string, the open A string can ring out if you are not careful. Lightly touch the strings you are not actively playing with the side of your fretting hand to keep them quiet. This takes practice, but it is what separates a clean version from a muddy one.

Adding Dynamics and Feel

Once you can play the riff cleanly, focus on the feel. The original recording uses a pick and plays with a slight emphasis on the first note of each cycle. This gives the riff a groove that makes people want to move. When you play the low E string at the 7th fret, hit it a little harder than the other notes. This accent makes the riff sit in the pocket and sound more like the recording.

The riff also benefits from palm muting on some notes. Palm muting means resting the side of your picking hand lightly on the strings near the bridge while you play. This deadens the tone slightly and creates a percussive effect. In "Can't Stop," the lead guitarist uses palm muting on some of the higher notes that play over the main riff, but the main riff itself is played with a clean, open tone. Focus on getting that clean tone first, and add palm muting later if you want to layer in the full arrangement.

Playing Along with the Song

The best way to lock in the riff is to play along with the original recording. Start the song and play just the first note—the 7th fret of the low E string—over and over until it lines up perfectly with the recording. Once that feels solid, add the second note (A string, 7th fret) and repeat the two-note pattern until it is tight. Build up one note at a time until you can play the entire four-note cycle in time with the track.

Use a music streaming service or YouTube to find the original version by Red Hot Chili Peppers. The song is in the album By the Way (2002). Play it at full speed first to hear how it should sound, then slow it down to 75 or 80 percent speed using your app's playback controls. Practice at this slower speed until you can play the riff without stopping, then gradually increase the speed back to normal.

Understanding the Song Structure

The main riff repeats for almost the entire song. There is no verse-chorus structure in the traditional sense—instead, the riff plays continuously while the lead guitar and vocals layer on top. The drums and bass lock into the same groove, so once you have the riff down, you have the backbone of the entire song.

The lead guitar parts that play over the riff use pentatonic scales and require faster finger movement and more complex techniques like bending and sliding. If you want to play those parts, you will need to learn the E minor pentatonic scale and practice techniques like string bending. However, the rhythm riff alone is enough to play the song with a backing track or with other musicians, and it is a solid foundation for understanding how the song is constructed.

Frequently Asked Questions

Do I need to use a pick or can I play this with my fingers?

The original recording uses a pick, and that is the easiest way to play the riff cleanly. A pick gives you better control over the tone and makes it easier to move between strings quickly. You can play it with your fingers if you prefer, but you will need to practice more to get the same clarity and speed.

What if I cannot reach the 8th fret on the G string?

If your hand is small or you are new to guitar, the stretch from the 7th fret to the 8th fret might feel awkward at first. Practice the stretch slowly and do not force it—your hand will adapt over time. Make sure you are using your index finger for the 7th frets and your middle finger for the 8th fret, which gives you the most reach and control.

How long does it take to learn this riff?

If you already know how to play barre chords and are comfortable moving around the fretboard, you can learn the basic riff in one or two practice sessions. Getting it tight enough to play along with the recording usually takes a week or two of regular practice. The key is repetition and listening carefully to the original.

Can I play this riff on a different part of the neck?

Yes, you can move the entire riff up or down the neck by playing it on different frets. However, the song is in the key of E, so playing it starting from the 7th fret of the low E string is the standard way. If you transpose it to a different key, the song will not match the original recording unless you also change the tuning or play with a capo.

What should I practice after I learn the riff?

Once the riff is solid, learn the lead guitar parts that play over it. These use the E minor pentatonic scale and include techniques like bending and sliding. You can also work on playing the riff while singing or humming the vocal melody, which helps you understand how the guitar and voice fit together in the song.