There are more rappers in the world then Youtube® videos. There are more rapper in the world the weed smokers. There are more rappers in the world in-house studios. With all of these rappers it leaves the game overcrowded and makes it hard for a particular rapper to find their unique niche. It doesn't have to take time to build your audience. All you require is very simple marketing tips.
Android® applications can be developed on the cheap by developers who have know how to use easy-to-use programming languages to create games, mobile comics, in-app billing and other ways to connect with your fans. Android applications are the easiest to create for a developer. It doesn't take a locked down platform like iOS or do you need outstanding licenses to do so. Best of all Android® mobile phones are so inexpensive people from all around the world can own one.
Easily acquire personalized application for your music by hiring a developer for about $1,000 a month at most, $500 an app at least. It's not that expensive. In this new world unless you plan to "Grind" all day and hustle while depending on luck -- you will fail.
After that, you would want to create a QR code for easy scanning on your posters that will link your fans right to your app. I always discuss AUTOMATION. The download after scanning of the QR will be practically automated and it cost only a few dollars to get a QR code set up.
Finally, be sure to add links to your app under your Youtube® music video or vlog. This will give the perception that you are a Youtube® personality in the making and encourage people to become immersed in your lifestyle.