SoundCloud is the first social network where millions of users are sharing their music with other music lovers and to the world. SoundCloud was founded and launched in 2008 by Alexander Ljung and Eric Wahlfjoss as a collaborative musical space. Since then, it has been so popular with over 20 million registered users.
If you want other people to listen to your music, then having a SoundCloud account is absolutely a must for you. But having an account is the end of it, you have to work in promoting this account to ensure it gets noticed. That your tracks are found and listened to.