Violinist Adam Markiewicz and harpist Marilu Donovan (LEYA) make amorphous, ambient avant-pop that sounds unlike anything else. On Friday, they shared Eyeline, a mixtape featuring collaborators from across the organized sound spectrum: Julie Byrne, Okay Kaya, Actress, claire rousay, Deli Girls, James K, Sunk Heaven, and Martha Skye Murphy all join the duo.