There are a few ways to get your music on a music blog. You can upload your music to a music hosting site, such as SoundCloud or Bandcamp, and then link to the blog post. You can also email the blog editor and ask if they would like to feature your song. Another option is to submit your music to a music contest.
There are many music contests available online, and some of them accept submissions directly through their website. If you are not sure how to get your music on a music blog, it is best to contact the blog editor directly.