The Lettermen The Lettermen is a musician known for their adult standards, bubblegum pop, easy listening, lounge and vocal harmony group music. Top tracks by The Lettermen Related artists Bobby Sherman Rita Coolidge Johnnie Ray The Four Aces Wishful Thinking Mel Carter Marco Sison Ray Peterson Lenny Welch Bobby Goldsboro Bobby Vinton Harpers Bizarre Pat Boone Nat King Cole The Spiral Starecase The Cascades Lou Christie