Over the summer, Son Little (a.k.a. Aaron Livingston) wrote a new song, “Shadows,” with La-based singer-songwriter Doe Paoro. While recently in Germany, they recorded a live performance for Cardinal Sessions. The collaboration, backed with elegant acoustic guitar, melds the duo’s vocals, creating a soulful, aching beauty. “Every struggle is its own kind of love.” Son Little will perform next in Philly on Friday, March 6 at The Fillmore on a billing that also includes Leon Bridges.