Eighth note

That's what it is.

When you realize that you can play eighth notes at 115, you have now realized that you cannot play eighth notes at 130.

So if your backing track is at 130, is that a good practice backing track for you? Maybe not.

You're trying to play something you can't even play.

Bread and butter, number one.

This is my favorite thing and this is by far, in my opinion, the single most important thing.

Eighth notes, and then to a lesser degree, 16th notes.

You lock into the beat and you create a groove.