Question: What is the name of the artist who both performed on the live album "Live at the Philharmonic" and, with his brothers, has had over thirty-three Top 40 singles?
Sentence (from "Live at the Philharmonic"): Guest artists included Willie Nelson, who was a little-known personality in country music at the time, Rita Coolidge, Kristofferson's future wife, and Larry Gatlin, whose career was in its starting phases.
Relevant evidence: Yes