 He also played on "The Early Years", "Fire and Brimstone", "Tattoos and Scally Caps" and "Dropkick Murphys/Ducky Boys Split 7 inch'and also the singles collection volume one as well as "give em the boot vol 1 

Erna was the first drummer for the Amerindie band the Blackjacks.He also played drums for the Outlets and Street Dogs, with Mike McColgan, the former Dropkick Murphys singer, on their first album "Savin Hill".Later, he played for the reformed Nervous Eaters.