Here's a musician with IM experience for 7 years.
Yeah, I've always wanted to be "a great songwriter", "a great singer", "a great piano/guitar player".
"Just what you want to be you will be in the end" Nights in White Satin, The Moody Blues.
"There's no thing you can done that can't be done... etc." All you need is love, The Beatles. Bono talks about this song saying that he thinks that when The Beatles wrote about Love they talked about believing in being able to achieve things, etc.
IM may be as old as the world.
"Where are we going John (Lennon)?"
"To the top, guys"
"And where is it?"
"To the toppermost of the poppermost" (the most famous thing in pop music)
And they did!. That dialogue was usual when The Beatles playing in small pubs and were hopeless.
I sometimes called the IM, the Toppermost of the Poppermost Law. I'm a Beatle fan, I can help it.
:-)