Whether you're an established Twitter user, or have a fledgling account and you're wanting some quality music-centric resources to follow, this is a great list.
I've been following Michael Brandvold for some time, recently impressed also by his securing the Social Media management for Dream Theater, a band I've supported and been immersed in for close to 20 years.
To access the list you must be a member of Klout. If you're not already a member, don't let this step stop you. It's worth the brief effort to signup.
Access "The Most Influential Music Marketing Professionals on Twitter" list here.