XSIDPLAY is a graphical front end (uses Qt) for libsidplay. SIDPLAY
emulates the Sound Interface Device chip (MOS 6581, commonly called
SID) and the Micro Processor Unit (MOS 6510) of the Commodore 64. Listen
to all those SID-tunes you remember so well again.

WWW: http://www.geocities.com/SiliconValley/Lakes/5147/
HVSC: http://www.hvsc.c64.org/