Question: I'm looking for an AI-powered music transcription service that can handle complex compositions and polyphonic playing.

If you need a powerful AI-based music transcription service, Klangio is a top contender. The service converts audio files or YouTube video links into sheet music, MIDI and MusicXML files, with features like polyphonic detection and customizable settings. It has a range of pricing options, including a free trial and subscription plans, so it should be useful to musicians at any level.

Another strong contender is Frettable, which uses sophisticated AI to create sheet music and MIDI files from recordings of instruments. It can export in multiple formats, and it has cloud storage and collaboration abilities. Frettable is available as a web app and mobile app, and it has two pricing tiers for different needs.

If you want to build transcription into your own project, Music AI has a broader Audio Intelligence Platform. It's geared more toward audio processing and content creation, but its large AI models and flexible integration abilities mean it can be used for music tech, too.