Amazon Fire stick is a modified version of Android, so you can install Android apps on it. But not all apps might work due to compatibility issues.
Piano Tap: Tiles Melody Magic is a Music android app developed by SENSOR NOTES. The latest version is 3.9 and the it requires a 4.0.3 android version to run it. Piano Tap: Tiles Magic - Free Music Game simplifies piano keyboard into white tiles and black tiles. Supports a wide variety of keyboard instruments (Piano, Grand Piano, Pipe Organ, Harpsichord, Accordion, Electric Guitar, Harp, Cello Pizzicato, Guzheng, Nylon Guitar, Plucked String, Music Box, Sitar, Xylophone, Harp, Vibes, Clarinet, Ukulele, Brass, Thai Bells, Tabbla, Dizi, Banjo, Flute, Saxophone, Cellto, Hamonica, Trumpet, Violin, Panpipe, Maracas, Tuba, Dulcimer, Kalimba,...) With Piano Tap: Tiles Magic, you can perform piano music by simply tapping piano tiles. With ease and fun, melody and rhythm of piano songs flow freely along your finger touch. It’s similar to other piano games, you just have to tap the music tiles then enjoy the wonderful music and rhythm in game.. Piano Tap was released 3 years ago, and is available for Free.