Here's a list of Top 100 Music Related Blogs based off traffic...

1	Listening Post		609	Wired.com's music blog.
2	All Music		1623	The most comprehensive music reference source on the planet
3	Hear Comes the Flood		3087	this is a blog about music. Real music. Live music. Its about guitars, king size keyboards, grumbling bass lines and pounding drums. Its about violins and violas. Its about left-field. Its about art.
4	Blob Musica		7410
5	Stereogum.com		10,228	blog devoted exclusively to music
6	ALis Blog		24,256
7	Music Videos and Lyrics - Music Lovers Group		46,855	A site dedicated entirely to music. Albums and video downloads, latest hits, music news, celebrities and other cool stuff, share music and download free mp3s. Join us building the biggest music community on the internet !
8	Unreality Music		48,318	We’re a music blog dedicated to sharing music news with the world, served up with a healthy dose of snark and cynicism. You’ll also find our opinions on the latest releases, and we love to cover unsigned/emerging bands that you may never have heard of.
9	Metal Underground.com		48,762	With a mission to help readers discover new metal music, MetalUnderground.com has been faithfully serving mainstream and underground metal news for over seven years. In addition to comprehensive news coverage, the site also features reviews, interviews, band info, live concert reports, photos, and more, updated daily by a dedicated staff of die-hard metalheads.
10	Pop Justice		52,337	Popjustice is also a weekly London club night, a range of illustrated pop biographies, a compilation album, a mobile service, a weekly email and a regular London live showcase night.

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http://www.dolphinmusic.co.uk/news/news-story/news_id/2348

Via: LHB