I'm a big jazz aficionado (and a trombone player) and I was curious if the song "Night Bird" (more information below) is a real song or a fictional jazz song.
"Night Bird" was a jazz song that Commander William Riker had been practicing on his trombone for ten years.
Riker, who was normally a very skilled musician, always had trouble with a solo part in the piece. It was for this reason that Counselor Troi requested the song during a jazz concert in 2369, but Riker was "saved" by a call from the bridge. (TNG: "Second Chances")