What's the best Android app for learning piano songs with visual falling notes?

Synthesia is a piano learning application designed for Android devices that emphasizes visual guidance through its signature falling-note display. In this system, colored notes descend onto a keyboard graphic, matching the timing and pitch of songs, which helps users associate keys with musical patterns intuitively. A key feature is the adjustable playback speed, allowing learners to slow down complex passages for practice before building up to full tempo. The app includes a built-in library of songs across genres, from classical to pop, and supports MIDI file imports for custom content, making it versatile for personalizing learning. For real-world use, a beginner might connect a MIDI keyboard to their Android device via USB or Bluetooth, then follow Synthesia's cues to learn a favorite tune during evening practice sessions. Users report that the visual feedback reduces frustration compared to traditional notation, especially for those with no prior musical training. However, some limitations exist: the free version restricts access to premium songs and displays ads, and the focus on visual mimicry may not adequately teach music theory or proper technique. Reviews indicate that while the app excels at song-based learning, supplemental resources are recommended for comprehensive musical education. Despite minor interface quirks, such as occasional lag on older devices, Synthesia remains a practical tool for acquiring piano skills through engaging, visual methods.