Honestly i think you gonna have hard (as you said) time to find something similar. There are audiocentric themes with functionality like that site on the different theme premium markets. Keep in mind that many themes (especially paid ones) with lot’s of features, bells and whistles and eye candy effects is almost everytime pretty bloated (in many cases because the customers want that). So stay away from themes (free or paid) that screams out
“200 Shortcodes! 50 sliders! Quicktags inserting cute pictures of kittens! Super Massive Amazing JS Player more advanced than iTunes and Spotify together!”
??
Maybe something you could create yourself? Or do a mockup and post it so others maybe could use that for a new theme?
