I think the biggest key in becoming a great musician is the desire to be great and a love for the music and instrument you are learning. If you do not have a passion for the music it is very difficult to become great at it.
Practice is one key element as you see posted above. However, I think to be truly successful at anything, one must feel it. You must love it and have a passion for the music and for making others feel it as you do. I have known many accomplished musicians, but only a very few were able to move me with their connection to the music itself and the emotion they were able to convey through the instruments--either vocal or instrumental.
I have to second and third the previous posts: PRACTICE is the key. I began taking piano lessons at age six and clarinet by age 10. I picked up the tenor sax at age 15 and also play baritone and soprano sax. I practiced for hours each day for many years until my desire waned. DESIRE may be the second most important suggestion I can offer. If you really want to be successful (i.e. a semi-professional or full-time professional), you must put in the time and love doing it. One can still be a successful musician as a sideline; in fact, I just came from a club where I knew all of the band members. They all hold down daytime jobs and practice their music in their spare time. They've been playing--and loving what they're doing--for decades, so if you're young, just realize that you improve slowly but consistently as you grow.
Well, from my experience as a musical theatre director and a mom of three kids who became solid musicians, my first response to your question is PRACTICE. With anything, be it sports, academics, or music, it takes repetition to get good at something.
Before that, however, make sure you have solid instruction from a qualified professional in your area of music. Seek out opportunities to play/sing for audiences to get the feel for performance, and the anxieties it might produce. Finally, it takes desire and hard work. Best of luck to you.
Are you asking how to be a successful musician? I think the biggest thing you need to focus on is practice, practice and more practice. The famous musicians of our day are notable for the way that they devote themselves entirely to their talent and maintain that discipline and drive throughout their childhood, teenage years and even beyond. I would say that the majority of famous musicians probably thought nothing of spending 2-3 hours a day, minimum, practising each day.
1)put emotion into whatever you play..... just let go of the senses of the world around you and concentrate just on making music.. and GOOD music... :)
2) PRACTISE!!!! :)
Fans. Musical success is measured by fans. Not only the number, but the quality. You should quite literally chest open, exposed, open-heart surgery every night on that stage, bleeding for your fans and your music. You should laugh when people say, ‘It’s amazing to see how hard you work.’ You're supposed to work hard! You could have the world at your fingertips. Don't saunter around the stage doing pelvic thrusts and lip-synching. Don't let that be why you're in this. You won't feel spiritually connected to anyone in Hollywood makeup and a gown with diamond earrings on. Just be a different breed. People want you to be thier cool older brother who you feel really connected with, who you feel understands you and refuses to judge anything about you because he’s been there.
People don't just want to relate to the music. We want to relate to & connect with the singer. That's the difference between a musician, and an artist.