cvsa/doc/en/about/scope-of-inclusion.md

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# Scope of Inclusion
CVSA contains many aspects of Chinese Vocal Synthesis, including songs, albums, artists (publisher, manipulators,
arranger, etc), singers and voice engines / voicebanks. 
For a **song**, it must meet the following conditions to be included in CVSA:
### Category 30
In principle, the songs featured in CVSA must be included in a video categorized under VOCALOID·UTAU (ID 30) that is
posted on Bilibili. In some special cases, this rule may not be enforced. 
### At Leats One Line of Chinese
The lyrics of the song must contain at least one line in Chinese. This means that even if a voicebank that only supports
Chinese is used, if the lyrics of the song do not contain Chinese, it will not be included in the CVSA.
### Using Vocal Synthesizer
To be included in CVSA, at least one line of the song must be produced by a Vocal Synthesizer (including harmony
vocals).
We define a vocal synthesizer as a software or system that generates synthesized singing voices by algorithmically
modeling vocal characteristics and producing audio from input parameters such as lyrics, pitch, and dynamics,
encompassing both waveform-concatenation-based (e.g., VOCALOID, UTAU) and AI-based (e.g., Synthesizer V, ACE Studio)
approaches, **but excluding voice conversion tools that solely alter the timbre of pre-existing recordings** (e.g.,
[so-vits svc](https://github.com/svc-develop-team/so-vits-svc)).