"Private press" records -- independently financed and usually limited to a few hundred copies -- are some of the most sought after by collectors.
Though many fall into obscurity over time, curious crate diggers rediscover these long-lost gems, some of which fetch hundreds or even thousands of dollars per copy.
The latest episode of Collector's Crossroads featured a wide selection of these releases. Take a listen to the songs via the Spotify playlist below.
Collector's Crossroads airs on CPR's OpenAir Thursdays at 3 p.m., Saturdays at 6 p.m. and Sundays at 4 p.m.
Follow CPR's OpenAir on Spotify for more curated playlists.