secondo

noun, plural se·con·di [si-kon-dee, –kohn-; Italian se-kawn-dee] /sɪˈkɒn di, -ˈkoʊn-; Italian sɛˈkɔn di/. Music.

1. the second or lower part in a duet, especially in a piano duet.
2. the performer playing this part.

noun plural -di (-diː)

1. the left-hand part in a piano duetCompare primo