Actually, it seems not all songs are recorded at the same bit rate. Checking through my library 2Pac's 'Me Against the World' plays at 834 kbps while 'California Love', which is off of the same CD, plays at 1.04 Mbps.

But 900 kbps is a rough average.

My Stuff :

M80's
QS8's
VP150
EP800
Denon 4802
Emotiva XPA-3
Samsung BD-P3600
Sharp 65 Inch Aquos LCD