As Betabeat rumored last week, Brooklyn-based music blog aggregator and cloud music start-up Hype Machine has finally released an iPhone and iPad app that has been in the works since the fall of 2009. The app, called Hype Radio, creates streaming music channels based on tracks posted by music blogs in Hype Machine’s directory. Channels include Latest, Popular, and My Friends, which streams what songs people in your social graph are listening to. Presumably, the hang-up was due to digital music rights issues.

Adrianne Jeffries is the editor of Betabeat. Follow Adrianne on Twitter or via RSS. ajeffries@observer.com