The answer is the horizon line.
Answer:
#1
Explanation:
ascending:
A, A#, B, C, C#, D, D#, E, F, F#, G, G#, A
descending:
A, Ab, G, Gb, F, E, Eb, D, Db, C, B, Bb, A
It goes by sharps ascending, and flats descending
The truth is that the Stylophone was invented in 1967 by Dubreq's Brian Jarvis
looked it up
