Maddux's arrangement gives that hook directly to the chorus, who deployed it with metronomic precision and a knowing wink. Underneath, the harmonic motion stayed close to the original's bright Scandinavian pop, with sparkling block chords on the chorus and warmer, more conversational support on the verses.

Rainbros approached "Mamma Mia" with the snap and intimacy of a small vocal group that knows each other well. The opening marimba-style figure was passed between voices in tight imitation; the verses were traded with theatrical timing; and the choruses bloomed into the kind of close-stacked harmony that small ensembles do better than anyone.