upbeat

Etymology

up- + beat

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. August 24 2022, Steve Murphy tells Paul Stephen, “Rail + property: a winning combination”, in RAIL, number 964, page 48

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.