Tyga - Ice Cream Man (Instrumental). The lyrics are awful, but the beat is good, so this is just the instrumental (modified to loop almost seamlessly with gapless-playback media players).
Cowboy Bebop - The Real Folk Blues.Cowboy Bebop's soundtrack is underappreciated for how good it is. This song is the one in the show's outro. The lyrics are deep, and the tune is very memorable. I wish I could've found a good instrumental for this.