Wiktionary
vb. 1 To select a channel, station, etc., as on television or radio. 2 (context idiomatic English) To pay attention.
WordNet
v. regulate (a radio or television set) in order to receive a certain station or program
Wikipedia
Tune In (Turn On The Acid House) is a single by Psychic TV. The title references Turn On, Tune In, Drop Out, a phrase by Timothy Leary.
The album was initially pressed to DC Records however after copyright issues of using Superman on the artwork it was repressed by Temple Records with alternate songs.
Usage examples of "tune in".
The air faintly hazed from cigarettes, the murky colors, the smoke-smudged wood, the men hunkered at the bar over big glasses of dark beer, the laughter of women, the murmuring voices, the piping tune in the background.
For the second tune in her life, Bronwynn rode through the enchanting fields of Ngandib-Mar.
You just sort of tune in to the patterns moving in the tree or the rock, and you forget you even exist.
He knew them, knew where they were, could even selectively tune in their whispers from amid the roar of the city.