text: Some composers , such as Mikhail Glinka , Alexander Serov , Rimsky-Korsakov , Puccini , and Mascagni wrote passages of music without text and subsequently had the librettist add words to the vocal melody lines .
simplified: Composers , such as Mikhail Glinka , Alexander Serov , Rimsky-Korsakov , Puccini , and Mascagni all did this sometimes .