Spectro-musical Xmas tree
The C-Major scale, played on a Wurlitzer piano from middle C, or C3 (around 260 Hz), to C4, one octave higher, This frequency-time-intensity map contains a lot of information about the piano tuning and about the playing technique. —Catalin Florea, Avo Photonics
—Catalin Florea Avo Photonics