Picture credits
The pictures used on this website are licensed under Creative Commons. They can be found at the following locations:
Flute
https://commons.wikimedia.org/wiki/File:Flûte_traversière_2.png
Clarinet
https://commons.wikimedia.org/wiki/File:Yamaha_Clarinet_YCL-457II-22_(rotated).jpg
.jpg){kind=link}
Alto saxophone
https://commons.wikimedia.org/wiki/File:Etude_Alto_Saxophone.JPG
French Horn
https://commons.wikimedia.org/wiki/File:French_horn_back.png
Trumpet
https://commons.wikimedia.org/wiki/File:Trumpet,_B_flat_-1623.jpg
Trombone
https://commons.wikimedia.org/wiki/File:Yamaha_Trombone_comparison_of_open_and_traditional_wrap.jpg
Tuba
https://en.wikipedia.org/wiki/Tuba#/media/File:Yamaha_Bass_tuba_YFB-822.tif
Violin
https://commons.wikimedia.org/wiki/File:Violin_front.jpg
Cello
https://nl.wikipedia.org/wiki/Cello#/media/Bestand:Cello_front_side.png
Double Bass
https://commons.wikimedia.org/wiki/File:AGK_bass1_full.jpg
Choir
https://upload.wikimedia.org/wikipedia/commons/a/ae/FHM-Choir-mk2006-02.jpg
Tokyo string quartet
https://www.flickr.com/photos/92269745@N00/4999895776
King’s College Cambridge
https://commons.wikimedia.org/wiki/File:King%27s_College,_Cambridge,_in_the_snow_1.jpg
King College Cambridge
My thanks to the original posters.