Riddle: I start as a seed, but I am not sown. You crack me…

Riddle

i-am-often-cracked-yet-never-spill-i-come-in-dozens-but

Riddle

i-have-keys-but-open-no-locks-i-have-strings-but-im-not

Riddle

what-dances-in-the-day-yet-hides-at-night-wears-a

Riddle

i-can-be-cracked-made-told-and-played-what-am-i

Riddle

i-measure-much-yet-have-no-weight-and-scale-the-heights