Rock & roll invaded America in the 50s just as television was building its stranglehold on the culture. Once you heard a great song on the radio, the desire to actually SEE the artist intensified. Fans would suddenly be able to put a face with voice(s) they loved. In 1956, Elvis sang multiple songs on the Ed Sullivan Show, and Sullivan egged him on to return later in the broadcast. Elvis started to deflect the host's suggestion but quickly agreed. Not long thereafter Elvis became so famous that he wouldn't take orders from geriatric show hosts. In the 60s. TV shows often used mixes of recorded music with some live overlay of vocals. Watch the The Mamas and Papas throw out some