upbeat

adj

1. Having a fast pace, tempo, or beat.

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

2. 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.”

   “But Murphy remains upbeat about the longer-term prospect of recovery and a resumption of the record growth in passenger volumes experienced in the UK in the two decades following privatisation.”

noun

1. 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.”