A Rumblefish, which developed a platform for musicians to micro-license music for use on sites such as YouTube, Vimeo and Shutterstock, is being acquired by SESAC, an organization that musicians and music users through licensing, royalty collection and distribution. Terms of the deal were not disclosed, although SESAC said it plans to invest in further developing Rumblefish. The Portland company will continue to run as an independent subsidiary of SESAC and current CEO Paul Anthony Troiana will…