Added a YT link (Unepic SID Channel) for the 2nd track just in case. :D
8580 signifies the MOS Technology 8580 sound chip, found in the Commodore 64 line of computers. 8580 is often referred to as the "new SID", since it was the second of two models - the 6581 preceded it in older models of the Commodore 64. More information at Wikipedia).
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The SID from HVSC has the 2nd subsong as the default track. However, like always, the file plays the 1st no-loop one.
Added a YT link (Unepic SID Channel) for the 2nd track just in case. :D