Question:  Jeff Mangum and Spider One, are singers, of which nationality?
Sentence (from "Jeff Mangum"): Jeff Mangum (born October 24, 1970) is an American singer, songwriter, and multi-instrumentalist, best known for his work as the lyricist, vocalist and guitarist of the band Neutral Milk Hotel, as well as being one of the cofounders of The Elephant 6 Recording Company.
Relevant evidence: Yes