(subclass MakingVocalMusic MakingMusic) | Merge.kif 13721-13721 | Singing is a subclass of making music |
(subclass MakingVocalMusic Vocalizing) | Merge.kif 13722-13722 | Singing is a subclass of vocalizing |
(subclass Singing MakingVocalMusic) | Merge.kif 13730-13730 | Singing is a subclass of singing |