I just added a new cherub-trombonist to the Trombone History Timeline (16th century) and to the HubPages article/collection, Trombone History: Cherubs Playing Trombone, amounting to 11 such images that I’ve been able to gather up. If you know of more, let me know!

Here’s the image, along with its timeline caption:

16th century—An anonymous print includes a trombone-playing cherub, or putto (see below image; public domain) (source: Beaux-arts de Paris).