1740, an instruction in musical scores, from It. segue
, lit. "now follows," meaning to play into the following movement without a break, third person sing. of seguire
"to follow," from L. sequi
"to follow," from PIE *sekw-
"to follow" (see sequel
). Extended noun sense of "transition without a break" is from 1937; the verb in this sense is first recorded 1958.