True. The sensation of a frequency is commonly referred to as the pitch of a sound. A high pitch sound corresponds to a high frequency sound wave and a low pitch sound corresponds to a low frequency sound wave. ... Such sound waves form the basis of intervals in music.
Animals (mostly bones) and trees
Hope this was what you were asking for :)
Answer:
Christmas because it is Jesus's birthday and we give gifts to other's and it's just fun to put up the Christmas tree and all the lights and stuff so yeah. Not to mention, it kinda gets us closer to our families.