David M. answered 08/18/19
Creative rhythmic explorations!
One technique to approach counting and feeling odd rhythmic time signatures is to break down the component groupings of 2 and 3 beats. Consider these Claves (keys) as fundamental rhythms in the lexicon of playing in odd time signatures. If we consider 7 as a combination of 2 and 3 note groupings we have 3 fundamental patterns: A: 2-2-3 B: 3-2-2 and C: 2-3-2. (Count 1-2-1-2-1-2-3 or 1-2-3-1-2-1-2- or 1-2-1-2-3-1-2). Learning to hear and feel these groupings and their relation to a larger pulse (7) will dramatically help improve your abilities with odd time-signatures. As always, start slow, count out loud, practice A LOT and with patience and persistence you will begin to feel as comfortable with these time-signatures as you do with the ones you've played a lot of music in.