I use Music CD-Rs with my digital keyboards when I'm recording my music, but sometimes there is a lot of space left on the CD that could be used for more recording. Is there such a thing as a "Mini" Music CD-R available so I can record only 20 to 30 minutes of music?

Thanks.

You don't have to buy blank discs specifically labelled for music. Any blank CD-R should work.

Mini CDs do exist (21 minutes), though its cheaper just to use standard discs and waste the extra space.

NOTE: Only use mini discs if your recorder uses a tray to load the cd. If its slot-load, the discs may get stuck!