Waves

This is currently the most popular craft meaning for "preparing a piece." It involves using epoxy resin to create realistic-looking ocean scenes on wood or canvas.

"Preparing" a piano involves placing objects (screws, rubber, bolts) on the strings to change the timbre. This is currently the most popular craft meaning

In music, "Waves" often refers to audio waveforms. There is a specific high-end virtual instrument called which features "prepared" piano sounds. This is currently the most popular craft meaning