Samples 178-180 and 178-350 are both from the same pair of Logrunners I recorded at O'Reillys. They are both examples of co-ordinated singing - I hesitate to say antiphonal duet. In sample 180, the "songs" are mainly in groups of three i.e. male-female-male but with the odd duet thrown in. In sample 350 they sing a different song, this time all in groups of two