Here are some popular link shorteners that are used in the music industry by music labels and artists.
Smarturl.com
This was probably the first link shorter offering aimed at the music industry from Gupta Media. SmartURL was designed to help simplify the process of marketing online and enable smarter marketing. Features and functionality include Geo-Aware Links, Live Redirects, Collaborative Management, Real-Time Stats and Simpler performance tracking (IQid). The company is a service of Gupta Media, based in New York.