SightSinger vs SoulX-Singer

SightSinger turns MusicXML sheet music into singing audio demos through a natural-language chat workflow. It is designed for score-led rehearsal and demo work, not writing songs from text prompts or full studio production. Choir and worship leaders can make section references and part-learning demos, including split SATB parts; music teachers, songwriters, arrangers, and independent singers are also named users. The site recommends.xml or.mxl files exported from MuseScore, Finale, Sibelius, Dorico, or Logic Pro. Its multi-track player supports score highlighting, repeats and endings, per-track mute, solo and volume, instrument sound changes, and mix downloads. Users can add movable-do or fixed-do solfege, including la-based or do-based minor options. SightSinger says it detects lyric language and supports Mandarin Chinese, Cantonese Chinese, Japanese, Thai, English, Spanish, French, Italian, Portuguese, and European Portuguese. Listed voices have voice-specific language and style support. Vocal audio costs one credit per 30 seconds for each vocal part each time it is rendered; MIDI accompaniment uses one credit per two minutes per uploaded score. The web service offers a free plan with eight monthly credits and paid plans from $6 per month.

SoulX-Singer is a singing voice synthesis model that generates voices for singers it has not been tuned on. Pitch, rhythm, and expression can be guided by melody-conditioned F0 contours or score-conditioned MIDI notes. Its voice-conversion system changes raw singing audio to a target singer’s voice while retaining melody, rhythm, and lyrics, without requiring lyric or MIDI transcriptions. It supports Mandarin Chinese, English, and Cantonese, plus singer-timbre cloning, cross-lingual synthesis, and lyric editing while retaining natural prosody. Preprocessing tools handle vocal separation, dereverberation, F0 extraction, voice activity detection, and lyric and note transcription. Users can edit MIDI metadata, including lyrics, phoneme alignment, pitches, and durations, before synthesis. Soul-AILab provides generation and conversion demos and a separate MIDI editor through Hugging Face Spaces; the repository also supports local inference. Code and model weights use the Apache 2.0 license. Maintainers caution that automatic preprocessing may misalign singing with lyrics and notes, so manual correction may be needed.