A 58% year-to-year increase in monthly unique visitors has resulted in imeem becoming the No. 1 destination for streaming music on the Web, according to statistics collected by compete.com in March 2008; the former No. 1, Yahoo! Music, slipped to No. 2 on a 14% year-to-year dip (9.6 million). Coming in at No. 7 on the Compete countdown with 2.3 million uniques: HM1500, a shorthand term for the aggregate unique-visitor traffic of more than 1,500 music blogs tracked by the Hype Machine. (The Machine itself is at No. 16.) One glaring omission from Compete’s list: YouTube, which I use for streaming much, much more than any of the sites in the top 20. (I know, I know, pulling music-only data out is a pain in the butt, but they’re an analytics company! They can analyze!) [Compete.com]