Watermelon obsessed singer/songwriter, Mark Johns ( no- she’s not a boy), is a well-known staple on the artist collective, MOVING CASTLE & a new addition to OWSLA, and now she is killing it with her latest original- ‘BTFU ( Mommy Issues).’ The girl crush is real. Produced by Brenton Duvall, hints of hip hop infused with soulful electro comprise…