This topic hasn't been revisited since 2014, and it's definitely time for another look. Rather than link back to that earlier post, I'll simply repeat, modify and update it here.
Guaraldi fans are lucky; all of the albums under his own name have remained in print and been readily available since their initial release, with new ones arriving rapidly these days.
But what about material that saw limited commercial release, or none at all?
Quite a few nuggets exist, thanks to the Web. Some are housed in authorized online archives that share them with the general public; others are bootlegs that (shall we say) lack that level of legitimacy, but nonetheless can be enjoyed by folks who haven't yet discovered them.
Onward!
Our first stop is SugarMegs Audio, "where live music lives since 1996." The site hosts a massive archive of more than 120,000 concert recordings, in whole or in part. Most are rock/pop, but you'll find other things as well. (One can get lost in this site for days...) On the homepage, scroll down to where THE STREAMING AUDIO COLLECTION is headlined, then click on the "database interface" link below. That'll bring up a page with a small white SEARCH box on the left. Enter the name "Guaraldi," and — as these words are typed — you'll get 15 hits. Most are other performers covering one or more Guaraldi songs, but two entries actually feature Vince. From the top, they are:
• A shared billing with no less than Carlos Santana, during a benefit for the College of Marin in Kentfield, California, on the afternoon of October 7, 1972. The band also included Coke and Pete Escovedo; other personnel, if present, remain unnamed. Although numerous sources agree that the entire show was broadcast by a local radio station — some claim KPFA, others KSAN — only two fragments seem to have survived: a portion of a jam running just shy of 7 minutes, and a second, longer fragment from an extended jam version of "Evil Ways," which clocks in at about 15:38. You'll find them both here, stitched together as a single file. Guaraldi's electric keyboard can be heard quite clearly throughout both fragments, although the melodic quality of his contribution is open to debate. Mostly, he delivers the extemporaneous riffs that characterized his occasional rock-inflected appearances at the Matrix, during this part of his career. This file's nice bonus, however, is the DJ who speaks over the music at roughly 20:40, to identify Santana on guitar, and Guaraldi on electric piano.
• The massive jam during the final night of the five-day farewell party for San Francisco's Fillmore West, which ran June 30-July 4, 1971. Guaraldi was part of the final evening's "San Francisco Musicians Jam," which included Van Morrison, the Tower of Power horn section, Quicksilver Messenger Service, Cold Blood, Hot Tuna, the Loading Zone and even rock impresario Bill Graham, on cowbell. The entry labeled "FillmoreWestFinalNightJams1971" focuses on that set. Guaraldi played electric organ. You'll be hard-pressed to hear him over the chaos, but you're welcome to try!