Your Accompanist (find them on Facebook too) targets the market for rehearsal tracks for singers, with plenty of downloads of scales, songs, arias, as well as song-learning kits. Your Accompanist positions itself as a resource for early-stage note learning prior to the first rehearsal:
There are lots of ways you can use our MP3s: familiarisation on-the-go, in a singing lesson, preparing for a choir try-out, in an audition, at home, in the car, in the bath, it's up to you. The tracks enable singing practice in situations where live piano accompaniment is not readily available.
Singers know that nothing can ever replace the collaborative experience of working with an experienced accompanist. Preparing for performances means building an artistic relationship and developing interpretations together. Our tracks enable you to learn the piece before you start rehearsing, allowing you to save valuable rehearsal time for interpretation.The cost for tracks is quite reasonable, priced at £0.99 (roughly equivalent to USD$1.47 and CDN$1.52 at today's exchange rates) and the quality of playing in the samples I heard was quite high (and sensitive too!).
On the other hand, PianoAccompaniments.com (also on Facebook) features the playing of Kristian Banatzianou and offers a much wider range of accompaniment products at various price points. In addition to an mp3 store, Kristian specializes in customized orders and can make CDs, MIDI, and Wave files, and also can transpose (w00t!). Although this might cost a bit more than purchasing single tracks, customised backing tracks can be a huge time-saver in certain cases, such as when a singer needs to learn a role on the road.
Here's a sample track of Kristian playing the piano part to Brahms' Sapphische Ode (feel free to sing along):
Are you a fan of backing tracks? If so, what are your experiences creating or using them?