 Complete the following phrase:  In March 1975, Teach-In participated in the 1975 Eurovision Song Contest with the song Ding-a-dong written by Will Luikinga and Eddy Ouwens and won. Teach-In broke an Eurovision convention that favours songs performing later in the program by winning the contest despite performing first. This was a first for the competition and was repeated a year later by Brotherhood of Man in the 