sight-read

/S AY1 T R EH0 D/
verb
  1. 1

    To perform a musical piece while reading it for the first time, without rehearsal.

    โ€œI can sight read really simple music, but hard pieces need a lot of practice so I don't have to stop and figure out what I'm doing.โ€

Source: https://en.wiktionary.org/wiki/sight%20read, https://en.wiktionary.org/wiki/sight-read, https://en.wiktionary.org/wiki/sightread