Thats an interesting reply actually because the same has been happening to me, though with me I've been listening to a type of music I never thought I'd get into - blues. It's only a specific type of blues though, I think it's like early 50's rock'n'roll like Rocket 88, Jimmy Reed, 'Combination Boogie', sort of hard driving uptempo blues. Some guy made his entire R&B collection available via the bit torrent network so I downloaded it and there are several hundred tracks, ranging from early rock n roll, New orleans, Sax players, Girl vocals, Doo wop and so on...a real voyage of discovery for me.
Avaialble on a bootleg mp3 disc from me very shortly