es: (1055.76 hours, 575000 samples)
- Google Crowd-sourced (OpenSLR)
- CML-TTS
- TED
- Common_Voice

en: (2241.64 hours, 1489000 samples, on Cloudflare)
- LibriTTS
- DailyTalk
- GigaSpeech (small)
- Common_Voice

zh: (574.95 hours, 454198 samples)
- Common_Voice
- AiShell
- AiShell-3
- Primewords (OpenSLR)
- ST-CMDS (OpenSLR)

pt: (133.80 hours ,76514 samples)
- CML-TTS
- Common_Voice