Question

Well-tempered instruments
(1 point)

can play in every key.

have a few intervals that sound out of tune.

are tuned so that every half step is almost equal—but not quite.

all of the above

Answer 1

All of the above.

Well temperament allows music to be played in every key, but the semitones are not exactly equal (they're adjusted differently), so some intervals sound slightly out of tune compared with pure intervals.