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For other uses of the word teach-in, see teach in

Teach-In were a group who won the Eurovision Song Contest 1975, representing the Netherlands. The victory was particularly notable because they were the first contestants to perform that year; it is generally considered an advantage to be last on stage.

The group had been formed in 1969 in Enschede. The first lineup: Hilda Felix (vocals), Henk Westendorp (vocals, later in Superfly), John Snuverink (vocals, guitar), Frans Schaddelee (bass), leader Koos Versteeg (vocals & keys) en Rudi Nijhuis (drums). In 1972, only Koos and Rudi remained in the group, and the rest of the band comprised this: Getty Kaspers (vocals, in 1976 solo as Getty), John Gaasbeek (bass, already in 1964 in the Stora Combo (later known as Orkest Freddie Golden), left in 1976 also), Chris de Wolde (guitar) and Ard Weeink (also until 1976). New members in 1976: Hans Nijland (bass, in 1977 replaced by Nick de Vos), Betty Vermeulen (vocals), Marianne Wolsink (vocals, ex-Head). In 1975 Teach-In participated in the Eurovision Song Contest.

From "Dutch Eurovision Biographies":

Teach-In were Gettie Kaspers, Chris de Wolde, Ard Weenink, Koos Versteeg, John Gaasbeek and Ruud Nijhuis. The band was formed in 1967, with a different line up as in 1975. Singer Getty joined the band in 1971, when they got their first recording contract with producer and composer Eddy Ouwens. In 1974 the band had three top 15 hits, after which their Eurovision entry was recorded. "Ding-A-Dong" won of course, which resulted in a chart entry in nearly every European country. Teach-In toured Europe for the next two years, but the success took its toll when the band split up in 1978. Getty tried a solo career, but that wasn't successful. In 1979 Ruud Nijhuis and Koos Versteeg reformed the band, this time with two new female singers. After three more hits the group split up again. In 1997, news came that the original line up (with Gettie Kaspers) had re-recorded some of their old hits and had plans to tour again.

Teach-In also is a method to program industrial robots by manually moving towards the command positions and saving them.