A recorder playing a single A1 note
A fretted bass guitar playing a single harmonic G note played at the twelfth fret.
An electric bass slaps a short overdriven A note.
A single high cello note on A.
West African calabash harp or lute playing single plucked A note.
An acoustic double bass plucking a single note in the key of A#.
An electric guitar picks a single fretted A note with a clean and dry tone.
A recorder playing a single A note
A piano playing a single C note.
A Takamine acoustic guitar picks the harmonic of a single B note that sustains for 1 second and then ...