The New Amsterdams is an American band featuring Matthew Pryor of The Get Up Kids. In a certain sense, they represented the acoustic counter-project to The Get up Kids. In contrast to The Get Up Kids, this project features acoustic guitars, the accordion, wind instruments, strings, and mature elements of American folklore. Among the members were also numerous musicians and contributors of The Get Up Kids and other friendly bands.

Source: Wikipedia (https://en.wikipedia.org/wiki/The_New_Amsterdams)