Here's a neat playlist of fundamentals, all with backing track, put together by a couple Vancouver Symphony trombonists, Brian Santero and Ilan Morgenstern.

I played through until video 42 today (skipping a good number of the alternate tempo versions). Some really great stuff!

<YOUTUBE id="tZF4dKvEni8" list="PLr56MAuQQHUiVIkiLEG5OLkAJO9DOqoPA"><LINK_TEXT text="https://www.youtube.com/watch?v=tZF4dKv ... PA&index=1">https://www.youtube.com/watch?v=tZF4dKvEni8&list=PLr56MAuQQHUiVIkiLEG5OLkAJO9DOqoPA&index=1</LINK_TEXT></YOUTUBE>

Wish there had been something like this for Remington studies when I was a lad. Thanks for posting!