Setting numbers before a filename

Hallo is it possible to set a number and a "-" before a filename automatically? I am bussy all the time to set these manually, with the F2 function. For example:
Child In Time must become 01-Child In Time
Smoke On The Water must become 02-Smoke On The Water

Has everyone experience with this? Is It possible with MP3tag?

see e.g. here:

Thanks, many thanks for your solution. It saves me a lot of time. Stuppid that I didn't ask it soner. I'am 2 years busy, everyday, editing MP-3 files. Now it goes much faster.