Candy's Music Shop
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In this store, the Kongs can each purchase their own instrument and upgrades for them. There are two instances where Candy adds an extra Watermelon to their life bar. After purchasing their instrument, the active Kong can have Candy replenish their instrument's energy, but this is also doable with Headphones.
Each Kong can purchase their instrument for three Banana Coins. By default, their instrument can be used up to ten times without a Music Pad. After the first Kong purchases their instrument, Candy increases every Kong's life bar capacity to two Watermelons.
Aside from the instruments, Candy offers a few more upgrades that slightly increases the Kongs' instrument capacity without using a Music Pad: