Not only is the person making the video unprofessional, but he doesn't seem to actually teach you how to play high notes; he just demonstrates and says what to do. He also gives some incorrect information, since nobody should try and cheat high notes, especially in the way he's saying to.

Good tutorial for Finale. It's a little lengthy, but gets the idea across and is easy to follow.

A hybrid performance made by one guy using Ableton and a saxophone.

The subreddit for music theory is a good place to ask questions or get music theory tips from professionals around the world. They also have great beginner's guides and resources on the side panel.

Another interactive score library that lets you view scores of many different works.

Facebook page for ASU's music education program. Students an post questions about the program/books for sale/questions/etc.

IMSLP has free public domain sheet music and scores for thousands of pieces of music available for study.