As he flipped through a yearbook he had fond memories of playing cornet in his what?\nOptions:\n- high school band\n- marching band\n- case\n- likes to day dream\n- museum
Stream of thoughts:
high school band
Cornet is a musical instrument generally played in a band.

Yearbook is a book in which people keep memories of their school days.

.

The final answer: high school band