When your band already has nineteen members (granted, not all appearing tonight) surely space would already become as issue. Anyone who has ever seen The Polyphonic Spree in a small club will attest to that fact.
Broken Social Scene pay no heed to such constraints using their headlining slot on the main stage to bring on every musician within a hundred yard radius. Amongst them were curators Explosions in the Sky who were placed around the centre microphone, and, ironically for a post-rock band, asked to sing without their instruments.
The Canadian supergroup were probably the perfect choice to round off proceedings on the main stage due to their possession of crowd-pleasing anthems a-plenty and a collective sound so massive that it rivalled the prior artist on the stage (De La Soul) for structural damage.
Bassist Brendan Canning provided the rock and roll attitude for the evening, throwing himself around as much as he spun his guitar around, which was a lot.