* SheetMusicPlus.com is another great website for finding male quartet sheet music. They have a large selection of music from a variety of genres, and you can also find free sheet music.
* J.W. Pepper & Son is a music retailer that sells sheet music, instruments, and other music-related products. They have a large selection of male quartet sheet music, and you can also find free sheet music.
* Walton Music is a music publisher that sells sheet music for a wide variety of instruments and ensembles, including male quartets. They have a large selection of music from a variety of genres, and you can also find free sheet music.
* Local music stores may also sell male quartet sheet music. You can find local music stores by searching online or by asking friends and family for recommendations.