Routine in our practice is a valuable thing. There is value in staying organized and focused in our quest to improve. However, too much routine can be detrimental to your growth as a drumset artist. This is an example of a long form improvisational exercise that I use with my students - I'll hold down a pattern (this one happens to be in 12/8), and the student's job is to not think - just create. It takes some time to free oneself from your own headspace. I recommend trying this for at least 15 - 20 minutes. Once you can spend a hour continuously in this headspace, some interesting things can result.
In this video, David Robinson comes up with some interesting ideas over the 12/8. Spend some time with this video and you will see what I mean.
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