New York - MusicNet, the music distribution unit of MediaNet Digital, said on Wednesday that it has partnered with DMX, a provider of music for commercial businesses and cable TV networks, to create a digital music subscription service and download store that also lets users access music collections on both PCs and portable devices. The Sonic Tap service will be powered by MusicNet, which counts a catalog of 4.5 million tracks, while DMX will offer its commercial customers the ability to provide brand-centric digital music services.