1" is a composition for piano and orchestra by the British musician Keith Emerson.
It was released on the 1977 album Works Volume 1, by the progressive rock band Emerson, Lake & Palmer.
According to Jim Allen of Ultimate Classic Rock, the piece is performed with the London Philharmonic Orchestra, and the piece "maximizes his classical inspirations while also finding time to work in some distinct jazz flavors".
Allen said that the piece was a "pretty ballsy move" to open an album, even for ELP standards.
1" is "on the level of a good music-student piece, without much original language", and that "where Emerson, in conjunction with his conductor and co-orchestrator, John Mayer, succeeds admirably is in writing beautiful virtuoso passages for the piano.