JSidplay2 is able to
load sound files with extensions: SID (PSID/RSID), MUS, DAT, P00, PRG, STR. You can find most of them in the High Voltage SID Collection, the biggest music collecton on earth.
play mono and stereo formats
play with custom sample rates (sample size is 16 bit)
load external SID Filter definition
check song length from Song Length database (SLDb – contained in HVSC)
be configured by an INI file containing emulation and player settings
be integrated into Java enabled platforms
being used like a real C64 (watching demos, playing games etc.)