Focus on your audience, not on yourself.
Focus on the one thing -- not three things, and certainly not fifteen -- that makes your company distinctive from your competition.
Think about your brand personality: cute and perky? bold and strong? serious and thoughtful? Now look for vocabulary and constructions that fit your personality.
Use Twitter to practice distilling your message. Nothing like a 140-character limit to force you to be succinct.
Use the thesaurus tool at Visual Thesaurus to explore constellations of synonyms: www.visualthesaurus.com In your case, I'd focus on words from the lexicon of music.
See my posts on building a better tagline: http://nancyfriedman.typepad.com/away_with_words/2012/03/building-a-better-tagline-part-2.html