For example, if you want a for a DJ forum or music archive: VA - DMC DJ Only – Club Class Volumes 1–17 (320 kbps)

A cornerstone collection for working DJs, DMC’s Club Class series delivers curated, club-ready edits and extended mixes across 17 volumes. Spanning house, electro, commercial dance, and vocal anthems from the late 2000s to mid-2010s, these compilations were strictly promo-only — never for retail. The 320 kbps encodes preserve the punchy dynamics needed for loud PA systems. Each volume typically includes 15–20 tracks, blending current chart hits with underground remixes, intro/outro edits, and occasional acapella tools. For DJs who lived through the CDJ era, Club Class remains a goldmine of usable, radio-friendly energy. Let me know how I can tailor this for you.

It looks like you’re referencing a specific series of DJ-only compilation albums: (likely in 320 kbps MP3 format).