Upbeat vs Buoyant - What's the difference?

As adjectives the difference between upbeat and buoyant

is that upbeat is having a fast pace, tempo, or beat while buoyant is having buoyancy; able to float.

is an unaccented beat at the start of a musical phrase.

* up-beat

(en adjective)

Having a fast pace, tempo, or beat.

The notes are easy, but it's an upbeat tune and should be played fairly quickly.

Having a positive, lively, or perky tone, attitude, etc.

Though he had bad news, he ended with an upbeat forecast for the future.

He sounded upbeat when I talked to him.

* downbeat

(en noun)

An unaccented beat at the start of a musical phrase.

(en adjective)

having buoyancy; able to float

lighthearted and lively

I’m in a buoyant mood.