upbeat

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.

An unaccented beat at the start of a musical phrase.

The conductor said: I give you three beats for nothing and then you come in on the upbeat.