sight-read
US /ˈsaɪt.riːd/
UK /ˈsaɪt.riːd/

1.
to read and perform (music) at sight, without previous practice
:
•
The pianist was able to sight-read the complex score effortlessly.
•
It takes years of practice to be able to sight-read well.
to read and perform (music) at sight, without previous practice