Loop it and sing it
C#m, A, G#, C#m
and some of the matching fills
C#m A G# C#m
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--9--7-----7-5----5--7-----7-9-|
--9--8-----8-6----6--8-----9-9-|
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Easy song to improv on. You can play the d note any time and it never sounds out of place. 