Question: "Foil" is a song by an American singer whose favored instrument is what?
Sentence (from "&quot;Weird Al&quot; Yankovic"): He is known for his humorous songs that make light of popular culture and often parody specific songs by contemporary musical acts, original songs that are style pastiches of the work of other acts, and polka medleys of several popular songs, featuring his favored instrument, the accordion.
Relevant evidence: Yes