Standard Sudoku rules are in effect.
4 digits in a white circle are to be distributed among the 4 neighboring cells, in indeterminate order.
Digits within a cage may not repeat, and they sum up to the value in the top left corner.
The grey stripes are palindromes, i.e., they read the same backwards as forwards. For example, 12321 or 123321.
Grey squares are even, grey circles are odd.
"Pa rum pum pum pum"
Solution code: The 2nd row, then the 2nd column
on 14. September 2021, 16:49 by glum_hippo
added online solving tool tag
on 24. December 2020, 15:57 by steelwool
Excellent drummer puzzle - happy Christmas!