I/O is the music project of Ayo Olatunji, a solo artist whose R&B-informed sound sticks its toes into the static of Weeknd-like musical textures, but a sound free of that artist's narcissism and nihilism. "I Wasted My Time," a single from I/O's imminent Isolated mixtape, shows off an attractive warmth, and for all of its subtlety and laid-back atmosphere, "I ...