When you drum, you have to be able to fully comprehend what you are doing. Singing your part might not seem like an essential tool, but if you can't sing your part, you won't be able to understand the true value of each note.⠀
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Try singing your part out loud, work on precise articulation, and practice using your tongue to mimic the sound of the drum. What you will notice is the parts you have trouble singing are the same parts you ave trouble playing. Use this method of singing your parts to isolate your inconsistencies and work it into your practice time.⠀