Katie Mullins is a Brooklyn-based singer/songwriter with a background as an opera singer and actress. Not your typical “girl with guitar,” she’s known for utilizing the mbira, a thumb-piano in the Zimbabwean tuning that she made herself, as well as a baritone ukulele and looping pedals to sculpt lush soundscapes to deliver her hauntingly beautiful songs. The recent addition of a keyboard to her arsenal has opened up new creative worlds for Katie, who spent a summer afternoon with BTRtv, hanging out in a rooftop pool in Gowanus, Brooklyn, using her new instrument to play the song "Boats And Buoys."