[xipix]

If you're learning guitar, drums, piano, trumpet, etc, you'll want to start playing along at about 75% speed then work up until you can play 110% faster than you need to. YouTube's built in audio time stretch makes this a painful exercise.

[exodust]

What's the benefit of learning to play faster than you need to? I understand wanting to play slower, but why faster?

[ballooney]

You want to play within your abilities, not right at the very edge of them. This technique nudges the edges out.

[ZoomZoomZoom]

Reliability builds on skill redundancy.