What is "pledgemusic"

PledgeMusic is an online Direct-to-Fan music platform, launched in August 2009, that facilitates musicians reaching out to their fanbase (termed Pledgers) to pre-sell, market, and distribute music projects including recordings, music videos, and concerts. Broadly speaking it bears some similarities to such platforms as ArtistShare, Kickstarter, Indiegogo, RocketHub and Sellaband.