Phish: Ambient Jams 1997-2000 (A Mix)
All that said... I've decided to share a home-made mix of instrumental jams from the band. I don't think you need to be a fan of the band to appreciate a couple hours of trippy background music to get you through your day. This particular mix (a double-CDR collection) focuses on jams from the tail end of Phish 1.0 (preceding a lengthy sabbatical), a time when the band's live shows were increasingly experimental affairs. I've edited out all the underlying songs, so all you have are the instrumental jam segments, segued together. It's mostly on the ambient side, quiet and atmospheric and perfect for zoning out, though there are some more upbeat segments mixed in to prevent this from going too far into Eno territory.
Here's the performance of the lead-off jam, arguably their most deep-space ambient exploration to date, from the Halloween 1998 performance of "Wolfman's Brother" (starting about 6:50 into the song):