Music lovin' grampas here and in Europe will be doing The Charleston when they hear about Rara.com, a cloud-based music service with them in mind, which launched today. Powered by Omnifone, the same whitelabel service behind Sony's Music Unlimited, Rara hopes to appeal to the 70 percent of people its research shows "do not 'do' digital music." There's access to the same ten-million-strong music library as other services, and pricing starts at a frugal 99c/p for the first three months (rising to 4.99 from there on in) for the web-only option. Those with a little more tech-smarts can us