where are all the pianos in fortnite battle royale?
['Stage 1: Find the Sheet Music in Pleasant Park. [00:00]', 'Stage 2: Play the Sheet Music at the Piano near Pleasant Park. [00:25]', 'Stage 3: Find the Sheet Music in Retail Row. [00:57]', 'Stage 4: Play the Sheet Music at the Piano near Retail Row. [01:19]']