Husband and wife, Brian “Tank” (bass/harmonica) and Beth “Beez” (guitar) Blankenship, added Jeff Teppema (fiddle) and someone named Charlie (guitar) for the performance.

Tank and the Beez describe themselves as an old-time roots string band, which made me wonder whether their instruments are made out of onions, potatoes, carrots, or radishes.

They specialize in traditional blues, folk, and jazz tunes and, by their own account, read their lyrics off an old-timey iPad.

The group’s other concession to modern technology was Jeff tuning his fiddle off an app on his cell phone. His fiddle looked suspiciously like a violin, which led me to a nice article in Strings Magazine, which has nothing to do with theoretical physics.

Jeff pulled a shaker out for one song, but unfortunately, one of the band’s other frequent members, Amy Malouf, was not there to play her washboard.

Beez and Tank nicely took the lead on most of the songs, but Charlie had his moment in the shade on one tune. Even before that it struck me that he appeared to speak like a would-be ventriloquist, with slight movements of the lips, while his teeth remained glued together.

Charlie noted that the song he sang was written in B Flat, and suggested that it was a common key when it was written about a hundred years ago, as it made it compatible with the hum of the electric lights in use in the United States.

Though Charlie’s singing was not on par with Tank’s, or especially Beez’s, he acquitted himself quite well on the guitar, which he suggested was Middle English for out of tune, a possible homage, given the group’s brand of music, to Pete Seeger’s line that “when you play the 12-string guitar, you spend half your life tuning the instrument and the other half playing it out of tune.”