His single season as Eagles OC in 1998, his QB's were Bobby Hoying and Koy Detmer. In his two seasons in Jacksonville, his quarterback was Byron Leftwich. In his three seasons in Minnesota his quarterbacks were Christian Ponder and Matt Cassel.
In the seasons between stints as an offensive coordinator in the NFL, Musgrave was a quarterbacks coach. That's his specialty. Which makes it all the more surprising in some regard that his playcalling leans more toward the run game and his running backs have career years under him.
His first season as an NFL coach was in 1997 with the Raiders as a quarterbacks coach. His assignment? Jeff George. That season George managed to throw for nearly 4000 yards (3917) with 29 touchdowns to 9 interceptions. It was the best season of his career.
He was next quarterbacks coach in Carolina and in his first season there, Steve Beurlein also had a career year, throwing for 4436 yards with 36 touchdowns to 15 interceptions.
In his second year in Jacksonville as offensive coordinator, Musgrave was also given the title of QB coach. Byron Leftwich had the best season of his career that year, throwing for 2941 yards with 15 TD's to 10 INT.
In one season in Washington in 2005, Musgrave had a 35-year-old Mark Brunell as his QB. Brunell threw for 3050 yards with 23 TD's and 10 INT. It was the most TD's Brunell had ever thrown, the third best passer rating of his career, and the last time he was a fulltime starter in the NFL.
Musgrave was the QB coach in Atlanta for the first three seasons of Matt Ryan's career. Ryan was named to a Pro Bowl in his third season, throwing for a then career high 3705 yards with 28 TD's to 9 INT. The Falcons finished 13-3 that year but lost to the Packers in the playoffs.
Last season with the Eagles, after losing Nick Foles to injury midseason, he coached Mark Sanchez to by far the best passer rating of his career (88.4), a good ten points higher than his previous best.
