First, let's tune our guitar or bass up with this amusing flash-animated doodad.
This is the coolest chord dictionary I've seen.
I've not used it much, but this site seems to be mercifully free of the usual sign-up-to-download garbage I've encountered at too many private archives of public-domain material.
Then, learn just about any Bob Dylan song you like.
Oscar Peterson breaks down multiple pianists' styles:
Here's another one of those fingerboard-as-sheet-music videos, transcribing the Jackson 5's greatest three minutes for fingerstyle solo guitar:
There is a bizarrely large population of ladies who play bass and apparently love recording and uploading videos of themselves playing along with the Jacksons, but I felt like a creep bookmarking any of them. Instead, I saved this dude, who displayed some added cleverness by apparently mounting the webcam to his bass:
I doubt I'll ever actually need to reference it, but Gregg Miner's studysite for Washington Phillips' gospel recordings featuring his singing and Dolceola-playing is undeniably valuable.
Samuel Hoffman [b. 1903] was a podiatrist and the only thereminist in the Los Angeles musicians union when Miklos Rosza hired him to perform in the orchestra for Alfred Hitchcock's film SPELLBOUND. Hoffman later played Theremin on scores for movies like THE LOST WEEKEND, RAW DEAL, THE DAY THE EARTH STOOD STILL, THE 5,000 FINGERS OF DR. T, THE TEN COMMANDMENTS and scads of crappy horror & sci-fi movies. The endlessly handy Thereminvox.com has a fine archive of mp3s featuring Hoffman, among others, available to download.
I like the cut of this guy's jib; demonstrating how swing-guitar icon Freddie Green might have negotiated the changes of Eldon Shamblin's "Milk Cow Blues:"
Speaking of Eldon: This isn't a lesson, but this short clip of him crooning and comping "There'll Be Some Changes Made" is so chockablock with amazing guitar ideas a conservatory could probably could wring a semester's worth of master classes from it:
I don't know what thrilled me more when I discovered Eldon Shamblin's recordings with Bob Wills & His Texas Playboys: that he so completely integrated bass lines, rhythm chording and fluid single lines or that I finally found a jazzbo who played a Stratocaster. [Leo Fender gave Shamblin a Strat prototype in 1954, making him one of the very first Stratcats.] I've occasionally heard that Shamblin recorded an instructional video for some small-potatoes, long-gone company, but have never seen it; if it exists, it must be delightful.
Finally, this track-by-track autopsy of the Rolling Stones' "Gimmie Shelter" is fascinating and quite educational, although the odds are good that ABKCO has coerced YouTube to delete the videos by the time you see this.