A few small errors I've noticed in Bartok Builds a Snowman, from Jesse Mattson's Season's Beatings:
- timpani is instructed to tune "G to G#" in m. 6, but the low drum is already a G#
- similarly, "29"; drum to Bb" is an unnecessary instruction for timpani at m. 47, as the 29" drum is already at a Bb from m. 44
- mm. 48-49, M1 and M2 parts got switched. If sharing a marimba, this doesn't work, so play those two bars just like the first two of the piece.
Perhaps I'm missing something, but these seemed like errors to me. :-)