Interesting new iTunes feature that appears to have recently launched. D45's are two-track singles that replicate the a/b-side and artwork of original 7" singles for a couple of dollars. Pickings are fairly slim and fairly 80s oriented at present, but a promising concept at least in the sense that it appears to be making otherwise hard-to-find 7" b-sides available. No direct link, but here's Marvin Gaye's Sexual Healing (7" instrumental version on the b-side). Shame they've actually had to define what a single was on the page though, or else I'm just fucking ancient.