GnuMusiq/media vector

A media vector is any place where you might hear, or hear about, music:

• Radio (broadcast or internet)
• TV (likewise)
• YouTube
• in-store music
• listening stations at larger music retail stores (or streamed samples in online stores)
• loaned CDs, MP3s, mix tapes and CD-Rs
• music reviews in newspapers and magazines
• the Billboard charts (Hot 100 etc.)
• posters and ads for local bands, for shows, or for the latest release from a larger act
• recommendations from friends

Why "Vector"?

I thought about calling them "media channels" instead of "media vectors", but the word "channels" has become overused in this context and I'd rather start with a word that didn't have a set of not-quite-right associations already attached.

Think of "vector" in the medical sense – a means by which something is spread through a population.