Crowdsourced Music: Remix the Mashup

With its feet firmly planted in the worlds of sample-based music and
global remix culture, crowdsourced music is taking our shared
fascination with the re-working and re-interpretation of sounds, songs,
and sources to an entirely new level of creative collaboration. New,
community-based social networking music sites not only allow musicians
to make finished songs available to be shared, sold, and remixed - but
they also allow musicians to participate in a collaborative process of
writing, selling, and distributing their music. What is this sound of
this meta-mashup?