Apart from the cat duet "Meeeeaouwww" (Lesley Garrett managed to do both parts by some technical wizardry!) - Macalias (Gill Bowman and Karine Polwart) - they are both a duo AND do duets when they sing two songs against each other, which harmonise and work very well, e.g. "FINE FLOWERS IN THE VALLEY" and "BONNY AT MORN"