White-throated Sparrow would be be a surprise in MD, and they don't usually come in people's garages. My guess would be Carolina Wren.
If it is a Carolina Wren, that thing could be in full-blown territorial mode until August at least, maybe longer.
Distant second-guess, Song Sparrow. Prob'ly be done in a month.
"...if the gentlemen of Virginia shall send us a dozen of their sons, we would take great care in their education, instruct them in all we know, and make men of them." Canasatego 1744
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