Stone Oakvalley's Authentic SID Collection is a project to convert every Commodore 64 song of the High Voltage Sid Collection into MP3 format (145449 of them!) using the actual machine rather than PC emulators. The sound difference between the analog chip and digital emulation is startling- the analog being much warmer, deep and possessing various natural inconsistencies. Each song was recorded from the three different versions of the Sid chip that was used in the Commodore 64. This sometimes results in diverse playings of the same composition as the three chips process information differently.
I have been sifting through the HVSC for a couple years, converting choice bits to MP3, so it is nice to have this massive library online where I can grab the authentic sounding version. Here are a few of the best ones I found recently: