A little companion piece to my bossa BD variations post- this should be helpful in giving your bossa someplace to go; as I mentioned before, a lot of people get married to the standard time feel and don't know where to take it from there.
Here I've transcribed just the left hand part from Dom Um Romão's performance on Agua de Beber, written and played by Antonio Carlos Jobim. The right hand plays 8th notes on the hihat or cymbal with a brush throughout, along with the standard bossa pattern on the bass drum. Where the bass drum or hihat are notated, he's doing something special with them; after that you can go back to the standard parts.
Measures 3 and 4 appear to be the foundational pattern for the tune, but as you can see, there is a lot of variety to the part; much of which follows the melody. It's notable that many of the section transitions are very softly handled- he'll leave space at the end of a phrase-ending fill (as in measures 16 and 32), and he usually doesn't punctuate the beginning of the new phrase.
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More bossa nova-related posts.
YouTube clip after the break: