I'm wondering if it really makes sense to post the same content on different sites. As in most cases steemit.com will be seen as 'the big/real one' by the major search engine bots, it may have negative effects on your own site's ranking.

Additionally, (As far as I know) those Wordpress plugins do take ~ 10% of your posting rewards, because they set their own account as beneficiary when broadcasting the posts. Just something to think about...

I guess the best way to reach a bigger audience would be to start posting into existing music communities on Steemit or start a new one and connect with other music fans on the platform. Of course, this will require a bunch of work and will not be done in just a few weeks.

I've planned to add a post and community promotion feature on SteemWorld in the near future. That could help to bring some users to your community.

Maybe I can vote some of your posts once in a while to help you get started. Much luck ;)