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![What does this +HB mean? I understand the LH RH but I've never seen this HB in all my time of playing piano. Can someone help out? : r/piano What does this +HB mean? I understand the LH RH but I've never seen this HB in all my time of playing piano. Can someone help out? : r/piano](https://i.redd.it/pz20u4bdf0681.jpg)
What does this +HB mean? I understand the LH RH but I've never seen this HB in all my time of playing piano. Can someone help out? : r/piano
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