In class activity:
Line drawings, showing the pitch of each sound
Video of grand piano sound:
By compiling three sound videos, I could recognize that the major vibrant sound is different by moving around the space while he was playing the piano.
All three sounds have the merged sound of talking, piano, and etc as the background in common.
Talking for the first clip, half talking and half piano for the second clip, and piano melody and the sound, created by hitting the keys for the third clip are the major sound for each one.