Normally the saying "hard work pays off", and can generally be applied to most things, with one exception being, the music business.

Without getting into a separate debate as to what defines success, you should do something in life that hopefully achieves two goals in a singular way; one, doing what makes you truly happy and fulfilled, and secondly being able to earn a living in doing so. One can be considered blessed if able to actually achieve both. (Many people are stuck in jobs that they hate, but because of mortgages, families, bills, they have no other choice, and lead lives filled with frustration and depression.)

With respect to a career in music, (and speaking from almost 20 years of personal experience) I would tell my children, that you would have to love it more than anything itself except perhaps family, and, breathing, and to do it because you feel compelled...but bear in mind that if your goal is to "make it in the business" the chances are about as good as winning a lottery ticket. I would caution them that they are entering a businesst that if they're lucky will give them back about 1/10th of what they give to it.

You can have all the talent and charisma in the world; be the greatest song writer, vocalist or instrumentalist ever heard, but if you're not the current "flavor of the month" that record companies are looking for, forget it. Talent is secondary. Marketing, promotion and business accumen are foremost. Most (not all) really good musicians lack the latter, and languish in obscurity because of it.

For every person or band that actually gets signed to a major label, there are a 100 others out there who are better and more often than not, more deserving.

It also depends on what you want out of life. I believe in having a trade or skill outside of music, that will enable you to earn a decent living, should the music business prove unsuccessful to you in accomplishing your dreams, or that at some point you give up, get burned out, or just decide you gave it your best shot, and it was just too much of a long term struggle to sustain.
It is also a nomadic, adventurous but very insecure lifestyle. Sometimes very romantic; sometimes filled with desperation and anguish.

If after everything I've said, my child is still undaunted (then unlike my own parents) I will support them in any way I can ---up to a point! *BG*