AUSTIN, Tex. — On the opening day of a special legislative session here Tuesday, a small circle of women stood in the Texas heat near the south steps of the Capitol, making soft, sweet and rebellious music.

The Resistance Choir of South Central Texas was warming up. Members of the Texas Legislature and their aides strolled past, without pausing. The Republican-dominated body, in a rush to pass a Republican-dominated 20-item agenda in 30 days, just doesn’t have time for a cappella. To the tune of “Day-O (The Banana Boat Song),” a Jamaican folk song popularized by Harry Belafonte, the Resistance Choir sang, “Day-O, Day-O, Texas Lege, don’t you wanna go home?”

When the song was over — complete with references to the bathroom bill, the ban on sanctuary cities and the $1 million taxpayer price-tag for the special session — Sara Jorgensen, 42, lyric sheet in hand, spoke of the ensemble’s primary goal.

“It is my hope,” Ms. Jorgensen said, “that at least one legislator gets this stuck in their head as an earworm and sort of goes about their business thinking, ‘Texas Lege, don’t you want to go home,’ and maybe they say, ‘Yes, yes, I do.’ And then head out.”