Multiple bands/artists go by the name Grin. 1. an early 70s American rock band best-known for featuring Nils Lofgren on guitar; 2. a two-piece psychedelic stoner band from Berlin (drums and bass); 3. a Dutch band based around musician and songwriter Maarten Veldhuis 4. an independent alternative rock band based in Chicago, now known as Quasar Wut-Wut; 5. a hardcore band from Wilkes Barre, PA, featuring members of United Youth 6. a band from Waterford, Ireland, in the early 90's.