The collaboration between indie-pop singer-songwriter Sufjan Stevens and underground rappers Serengeti and Son Lux is about as strange as you’d think, but that’s not a bad thing. Sisyphus finds common ground between these three without sacrificing anyone’s individual identity. Sufjan is well-represented in these compositions, particularly referencing the stuttering laptop-pop of his album The Age of Adz. The rappers own the mic on opener “Calm It Down,” which sounds like the classic alternative-hip-hop of acts like De La Soul and A Tribe Called Quest without trying too hard, given the song’s low-key lap-hop arrangement and amenable rhymes. The trio pull of a song like “Booty Call” with old school flavor, yet they go about a decidedly strange way of getting there, with odd breaks and pauses interrupting the song’s friendly flow. Occasionally it’s an odd mix, given extra sensitive tracks from Stevens like “Take Me” and “I Won’t Be Afraid” (sample lyrics: “I will lift my hands…I will tear my clothes”). However, when the three find common ground, the results can be thrilling, like how “My Oh My” switches from pairs heady rhymes with Steven’s alluring chorus, or “Rhythm of Devotion’s” general awesomeness, filling the void left by Gorillaz with intellectual yet party-friendly computer-built industrial beats, the emcees’ rousing rhymes and Stevens’ convincing R&B coo. Sisyphus might be just the start to a fruitful collaboration.