While with the Dropkick Murphys, he played drums on their Boys on the Docks EP. 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.
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.
- "Cellars by Starlight | Working-class city rockers". Bostonphoenix.com. Archived from the original on 2012-02-06. Retrieved 2012-09-01.
- "BandToBand.com". BandToBand.com. Retrieved 2012-09-01.
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