Also that year the single "Gaudete" from "Below the Salt" became a Christmas hit single, reaching number 14 in the UK Singles Chart, although, being an a cappella piece, taken from the late renaissance song collection "Piae Cantiones" from Finland and sung entirely in Latin, this can neither be considered representative of the band's music, nor of the album from which it was taken. This proved to be their commercial breakthrough and saw them performing on "Top of the Pops" for the first time. They often include it as a concert encore. Their popularity was also helped by the fact that they often performed as an opening act for fellow Chrysalis artists Jethro Tull.