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.
https://7techgirl.com/apk/31474
OR https://7techgirl.com/cid/31474
. Piano Detector is a Music android app developed by SENSOR NOTES. The latest version is 4.6 and the it requires a 4.2 android version to run it. FEATURES ✔ Full piano keyboard with 88 keys ✔ 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,...) ✔ Multi play modes help you practice more easily: Piano Tiles, Piano Keyboard, MIDI Keyboard ✔ Dual piano keyboard with full feature make playing music easier ✔ There are more than 650,000+ songs for you to practice ✔ Recording your song ✔ Connect and play with MIDI keyboard ✔ Save downloaded MIDI file to external storage ✔ Read and Playback recordings from external storage ✔ Load MIDI file to external storage to play on virtual piano (on app) or real piano device (MIDI Keyboard) with USB OTG Cable/MIDI Cable. Piano Detector was released 3 years ago, and is available for Free.