Zachary Amaranth said:
That's really not "all" they're doing at all.
Sure it is. Read the patent.
"a system for progressive musical instruction comprising:"
a teaching game
"a processor-readable memory medium having software residing thereon, the software executable by a processor"
on a computer/console
"to direct the performance of generating audio signals corresponding to a predetermined musical performance, the audio signals in a first operating mode including prerecorded sounds from each of one or more musical instruments associated with the musical performance, the audio signals in a second operating mode including sounds from said instruments with the exception of a predetermined musical instrument;"
in which you listen to and play along with music
"generating display signals corresponding to the musical performance, the display signals arranged to provide musical instruction to a user relating to playing of the predetermined musical instrument during at least the second operating mode;"
with the notes displayed on the screen
"and in association with successive iterations of the musical performance,"
played repeatedly
"incrementing a duration of the second mode and decrementing a duration of the first mode"
with increasing difficulty
That is extremely sweeping, with vast quantities of prior art (I could even cite
Monkey Island's banjo duel), and nothing novel whatsoever. Such a thing should never be granted a patent.