Sentence:  The drama in the theater and the concert in the hall both have a fixed time , but the time is fixed by the director and the players , the conductor and the instrumentalists , subject , therefore , to much variation , as <WSD>record</WSD> collectors well know . 
Meaning of the word marked with <WSD> tags:  sound recording consisting of a disk with a continuous groove; used to reproduce music by rotating while a phonograph needle tracks in the groove