3.6 / 5

Part Player

Practice your part while AI plays everyone else's

Useful

The Problem

Ensemble music requires ensemble rehearsal; solo practice lacks context

Current Solutions (Not Great)

MIDI minus-one tracks (rigid), recording with yourself (tedious), limited ensemble rehearsals

Who Needs This

Orchestra musicians, chamber music players, band members, musical theater pit musicians

Learning an orchestral part, chamber music, or band arrangement means practicing your part alone until you can rehearse with others. Part Player plays all the other parts while you play yours—the full musical context, so you know how your part fits. It follows your tempo, adjusts to your rubato, and cues your entrances. It's like having the rest of the ensemble available whenever you want to practice. Perfect for solo rehearsal that prepares you for real performance.

Honest Take

SmartMusic dominates this education market with school contracts, so you're up against an entrenched player. That said, their pricing is aggressive and many musicians find it frustrating, so there's room for a better, cheaper alternative. The tempo-following tech is the key differentiator.

Monetization Ideas

Ways to turn this into revenue

Freemium

Free basic, $5-15/mo for pro

Subscription

$5-29/month or $49-199/year

One-Time Purchase

$9-49 per license

Features

Key features that make this app valuable

Load multi-part MIDI/MusicXML scores
Mute your part, play along with others
Tempo follows your playing
Entrance cues
Repeat sections for drilling
Slow practice mode
Balance adjustment between parts
Visual score following

Build Prompt

Use this prompt with an AI assistant to start building

Build a React PWA called 'Part Player' using WebInfer, Web MIDI API, and File System Access API. Score loading: accept MIDI file or MusicXML, parse into parts (File System Access API for loading). Part selection: dropdown to choose 'Your Part' (this track is muted, you play it live). Playback: other parts play via Web Audio synthesis. Tempo following: analyze user's MIDI input timing vs. expected timing, adjust playback tempo smoothly using playbackRate or reschedule events. Use generateObject for tempo analysis: { userTempo: number, scorePosition: number, tempoAdjustment: number, nextEntrance: number }. UI: minimal score view showing your part with cursor, measure numbers, tempo display. Practice features: loop selection (drag bars to repeat section), slow practice (50%-100% tempo), count-in before starting. Balance: per-part volume sliders. Entrance cues: visual and optional audio click before your entrances. Sound: select instrument sounds per part or use GM MIDI sounds. Export: record your performance merged with accompaniment.

Score Breakdown

Pain