I believe having the choice to erase or to not erase is the more important thing here. Having control and knowing how to grow from one's past experience is subject to the person.. either (a) it's difficult to try and forget one's worst memory, which makes them stuck; or (b) it's difficult to not regress, since they have erased the memories which sets foot to which past endurances had been overcome otherwise.
Understanding Acoustic vibration can be utilized in many avenues for study. Music, of course, but also in construction; environmental health; colour relationships and art forms, as a few… Essential background knowledge for musical instrument making.