Educational Videos

Classicalclips.com is a great place to go listen to classical music. It also contains short lectures by professional musicians on how to do certain things on your instrument.
MusicTheory.net is a great site for all things theory and ear-training.
This woodwind fingering guide is the best one I’ve found, as it has the most options for alternate fingerings.
Here is a fantastic online music dictionary.

Instrumental Educational videos.

On hearing notes and harmony, with Ingrid Jensen.
Developing Improvisation skills through games, with Walter Blanding.

Flute.
Flute tuning.
Breathing on Flute, with Emily Baynon.

Bassoon and Oboe.
Oboe tuning.
Bassoon tuning.

Clarinet and Saxophone.Projecting Sound on the Clarinet. Victor Goines.
How to bend notes on saxophone.
Todd Williams, Blues inflections in Jazz.
Joe Allard. The Master Speaks.
Jonathan Jones. Clarinet Embouchure.Michelle Anderson. Clarinet mistakes.Harvey Pittel (saxophone). A great series of educational videos.
Clarinet tuning.
Bass clarinet tuning.
Alto saxophone tuning.
Tenor saxophone tuning.
Baritone saxophone tuning.

Brass.
Charlie Porter. Brass Embouchure.
How to oil a French Horn.
Kenny Rampton. Warming up and practicing. Part 1. Part 2. Part 3. Part 4.
Chris Crenshaw and Elliot Mason. Warming Up The Trombone.
Blues Inflections on Trumpet.
How to bend notes on brass instruments.
Trombone Plunger Technique. Chris Crenshaw.

Rhythm Section.
How to tie together a rhythm section. JLCO.
Fundamentals of Jazz Bass. JLCO.
How to build a walking bass line. JLCO.
“Rhythm Changes” on Bass. JLCO.
Left Hand Technique on Bass. JLCO.
Getting started on double bass. Kodi Hutchinson. Kodi teachers how to play a B flat major scale at 13:20.
Chromatic Scale on the double bass. John Goldsby. Note how he shifts from 1/2 position to first position on the first two notes on each string. Ie. He uses his first finger for the bottom two notes, and then goes to second and then fourth fingers.
Finding the notes on the double bass. John Goldsby.
F and G Major scales on the double bass. This is a good video for grasping the concepts of 1/2 and first position.

Percussion.
Josh Jones, Triangle Technique. Tambourine Technique.
Matt Strauss, Ornaments on Snare Drum. Rob Maciak. Orchestral roll technique. Accented vs. non-accented notes. Double-stroke rolls.
Charlie Wilcoxon’s All-American Drummer. PDF. Charley_Wilcoxon_The_All_American_Drumme (1)
Solo No. 1.
Solo No 4.
Stick Control exercises. Page 13, 1-4.
Stick Control exercises, Page 13, 5-8.
Stick Control exercises, Page 13, 9-12.
Stick Control exercises, Page 13, 9-12, fast.
Stick Control exercises, Page 20, 97-100 and 109-112.
Stick Control exercises, Page 22, 145-148.
Stick Control exercises, Page 22, 157-160.
Stick Control exercises, Page 24, 1-6.
Stick Control exercises, Page 24, 19-24.
Paradiddle Johnnie, PDF. Paradiddle Johnnie
Paradiddle Johnnie, very slow.
Paradiddle Johnnie, a little less slow.

Choral Educational Videos. 

Aimee Nolte. Simon and Garfunkel and how to make up harmonies.

Marion Cowings. Vocal Improv and Warmups.  How to Lead a Fresh Band.
JLCO vocalists. How to scat.