Real instrument photographs from Wikimedia Commons. Images are converted to WebP and displayed in responsive square crops; photographs retain their original licences. These pictures illustrate instrument types, rather than identifying the particular instruments used for the recordings.

Instrument	Photographer / creator	Licence	Source & attribution
Piano	Steinway & Sons	CC BY-SA 3.0	Original photograph ↗
Acoustic guitar	User:Maxo	CC BY-SA 2.5	Original photograph ↗
Electric bass	Public-domain photograph; see source page.	Public domain	Original photograph ↗
Violin	Just plain Bill	CC0	Original photograph ↗
Cello	Georg Feitscher	CC BY 3.0	Original photograph ↗
Flute	Tubamirum	CC BY-SA 4.0	Original photograph ↗
Trumpet	PJ, background cropped by EWikist	CC BY-SA 3.0	Original photograph ↗
Xylophone	Roumpf	CC BY-SA 3.0	Original photograph ↗