A busker in the Vienna subway. Busking is regulated, with buskers auditioning for 90 minutes spots in the busiest stations.

A busker in the Vienna subway. Busking is regulated, with buskers auditioning for 90 minutes spots in the busiest stations.

A busker in the Vienna subway. Busking is regulated, with buskers auditioning for 90 minutes spots in the busiest stations.

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