Jem Aswad Senior Music EditorVeteran agent and former WME head of music Marc Geiger says the live-music business will rebound in a big way once the coronavirus pandemic recedes.In a conversation with Goldman Sachs’ music specialist Lisa Yang at the International Festival Forum in London on Wednesday, Geiger said the “claustrophobia economy” of the pandemic will be replaced by “a second Roaring ‘20s, a hundred years later,” of economic growth, according to IQ.He was referencing the giddy