late 14c., "a musical sound, a succession of musical notes," unexplained variant of tone
. Meaning "state of being in proper pitch" is from mid-15c.; the verb in this sense is recorded from c.1500. Non-musical meaning "to adjust an organ or receiver" is recorded from 1887. Verbal phrase tune in
in reference to radio (later also TV) is recorded from 1913; figurative sense of "become aware" is recorded from 1926. Tune out
"to eliminate radio reception" is recorded from 1908; fig. sense of "disregard, stop heeding" is from 1928. Tunesmith
is a U.S. colloquial coinage first recorded 1926.