There is so much you can do with a logo. One thing you need for you or your band is recognition for your brand. Today there is so much going on in the music industry, where competition is fierce, and we all know that getting into the music industry despite your talents is tough enough while even not taking into the account of the clutter of new musicians and bands of every genre coming out every day.
A good thoughtful logo for your brand will help you stand out from that massive crowd. A good logo can be placed on your website, your social media profiles, your other cover art, and your merch such as hats, t shirts, etc.
But if you need something quick, its going to take a few bucks to buy some social profile sets and a professional logo for your website and web presence on your social media channels and pages.