Since 2011, Lisbon's Principe label has been documenting the fertile digital music hybrids prevalent in Angola, where upbeat rhythms like kuduro, batida and kizomba (themselves mutations on Caribbean soca and native semba dances) meet tribal house and grime. Primarily reaching outsiders via mp3s, Principe houses their tracks in lovely hand-stenciled record sleeves. The nascent label’s newest release showcases six new DJs (bonus tracks are also available on their Soundcloud), with “O Vento Uma Verdadeira Amizade” (which freetranslation.com helpfully translates as “The Wind a True Friendship”) featuring three of them in collaboration. Digital bandoneón and brass wheezes along, a snare skips, with digital bloops skirting about the spare and breezy rhythm. It’s as strange and spacious as early grime, yet suffused with tropical warmth. But instead of thinking it “tropical grime,” maybe think of it as “sand.”