That would be Eric Johnson, "Cliffs of Dover", off his 1989 opus Ah Via Musicom. Great album. "Trademark" is one of those songs that makes driving through the city at night a little classier.
By the way, the best definition of a riff that I have found comes from Del Close's 1961 album How to Speak Hip: "an improvisation centered on a theme".
Let's say you have a tune everyone knows, such as "Someday My Prince Will Come". There is a simple melody, a key or two that it's in, and then it's finished. The riff is the process of rolling into that tune and going new places with it. You're still within the scale of the key or keys but you're adding notes.
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By the way, the best definition of a riff that I have found comes from Del Close's 1961 album How to Speak Hip: "an improvisation centered on a theme".
Let's say you have a tune everyone knows, such as "Someday My Prince Will Come". There is a simple melody, a key or two that it's in, and then it's finished. The riff is the process of rolling into that tune and going new places with it. You're still within the scale of the key or keys but you're adding notes.