VIDEO: A group of DeKalb County firefighters showed off their musical skills during a recent jam session. In a video posted to Twitter, DeKalb County Fire Company 23C jammed together to Carlos Santana's "Maria Maria" in a "post workout jam session." A group of DeKalb County firefighters showed off their musical skills during a recent jam session. In a video posted to Twitter, DeKalb County Fire Company 23C jammed together to Carlos Santana's "Maria Maria" in a "post workout jam session." "All instruments and voices are authentic. The apparatus bay creates a great acoustic setting," officials said.