He immediately started playing the opening riff for "Flush".

The opening riff was extended about thirty seconds while introductions were being made.

Newsweek has called the opening riff "five notes that shook the world".

The song started out as an instrumental piece of music with the opening riff being the main feature.

They did and they caught the opening riff of a Metallica song.

The opening riffs of the two songs are virtually identical.

When I added the opening riff, it completely changed the character of the song.

The opening riff is one of my favorite things ever.

The soloist's opening riff is hair-raising, almost worth the price of the album.

Buckethead usually plays the opening riff between a song.