I'd like to find out who was playing the trumpet and the name of the song that was played I think near the end of this episode.
Here's a description I found of that episode:

A thick fog enshrouds the station for one of the most downbeat episodes of the entire series. His optimism spent after another rejection for the deputy inspector's rank, Barney finally faces the grim futility of his job. "It's getting harder and harder to keep a sense of purpose around here," he grieves. "We bring people in, we ship 'em out. Nothing changes." After the other detectives fail to raise his bitter spirits, it's finally the mournful melody of the street musician's slow blues that draws the detective away from his gloom. As the sublime melancholy of the lonely horn fills the corners of Barney's own private dread, he rises to join his fellow detectives in the squad room. While outside his window, the fog only grows thicker.

I'm a big blues fan and even though I haven't seen that episode in years, it always stood out because of the great blues music from the street musician.

Can anybody help me out here, who was the trumpet player and what was the name of the song?