Lots of people have been playing around with the form of R&B music lately, twisting it up to arty ends. And a lot of that stuff is really, really great. But R&B, even in its poppiest and most accessible forms, can also be a wonderful thing when done straight-up, with vision and confidence. And Aquarius, the official debut from the L.A. singer Tinashe, is the best straight-up R&B album I’ve heard in some time. We’ve posted a few of its early tracks — the hit “2 On” with Schoolboy Q, “Pretend” with A$AP Rocky,” “Bet” with Dev Hynes, “Feels Like Vegas.” But the whole album rules, and now you can stream it all at iTunes.