(subclass MakingVocalMusic MakingMusic) | Merge.kif 13743-13743 | Singing is a subclass of making music |
(subclass MakingVocalMusic Vocalizing) | Merge.kif 13744-13744 | Singing is a subclass of vocalizing |
(subclass Singing MakingVocalMusic) | Merge.kif 13752-13752 | Singing is a subclass of singing |