For readability purposes, we don't recommend very small font size and too many texts.
As long as the order hasn't been fulfilled yet and there's usable space in the music box surface, we can still add more text / edit engraving.
You can engrave multiple lines of text on our music boxes. However, with more lines the font will get smaller.
Below is an example of our 3 x 2.5 inch / 7 x 6.5 cm music box engraved with 10 lines of text. For comparison you can see a U.S. Quarter and a printed page at 10pt font size.