After several years of performing as a solo artist, he became a member of the folk group The Limeliters, replacing Glenn Yarborough.

[5] Teaching Peace, named by the All Music Guide as “one of the top five children's recordings of all time”, was the recipient of a rare Parents' Choice Classic Award.

[7] Other albums for children include: "Circle of Light: Songs for Bucket Fillers", Hello World, Down the Do-Re-Mi, Can You Sound Just Like Me?

Grammer has performed in every state in the U.S. as well as in 22 other countries around the world, including China, Russia, Ukraine, and Israel.

He is often a keynote speaker and performer at national and regional educational conferences in the United States and Canada.