These are the audio files for Back to Black. Download the file for your part, plus the file that is just called Back to Black, which has all parts.
An MP3 player should recognise the files as being part of an album called MCC July 14 with artist Medina Community Choir.
In terms of instruments used, sopranos are violin, altos church organ, tenor trombone and basses bassoon; the solo part is a piano. The sound is also panned in the stereo field, so sopranos and tenors are fully on the left side; altos and basses fully on the right side.