Sentence:  Some clue to the character of London 's approach in these <WSD>discs</WSD> may be gained immediately from the fact that ten of the 12 titles include the word `` percussion '' or `` percussive '' . 
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