The “Don’t Let Me Down” riff is a memorable, energetic guitar part from the song “Don’t Let Me Down” by The Chainsmokers featuring Daya. While the song has a primarily electronic-based production, there is a catchy, repetitive guitar line that underpins the chorus.

If you’re asking for a guitar riff, the intro and the chorus part are often what people refer to. Here’s how you might break down the main riff:

1. Key: The song is in C major.
2. Guitar Riff: It’s based on a rhythmic, repeating pattern that fits the song’s upbeat vibe.

For a simple version of the riff:

• Start with C chord.
• Move to Am (A minor) chord.
• Then to F chord.
• And finish with G chord.

The key here is the rhythmic strumming or picking pattern that matches the song’s electronic feel.

If you wanted a more specific tablature or notation for it, I’d be happy to help!