As a record pool, we can only post what the record labels send to us. We're different than a music retailer like iTunes or Amazon - we don't have everything. We only have what the labels are promoting.
Labels choose to promote their new tracks, so we unfortunately don't have a ton of old school music. With that said, we do sometimes receive remixes of old school tracks and our library goes back to 2015.
Thankfully, we're working with more labels and expect to have a large increase in available tracks in the near future.