For purpose of this article, monsters can be categorized into two categories and four subcategories. These are not categories recognized by the game, but based on observation.
- Vocal - Monsters that are using their vocal chords to sing, or play recordings of singing
- Lyrical - Singing actual words or sentences
- Non-Lyrical - Gibberish, Scat singing, humming, moaning, etc.
- Instrumental - Playing an instrument
- Internal Instrument - The instrument is part of the Monster's body
- External Instrument - The instrument is not part of the Monster's body
List of Monsters
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