inspiration for Super Mario Bros

How did the guys at Nintendo come up with the concept of Super Mario Bros?
It sure is a strange mix. Italian plummers, mushrooms, turtles, etc.
And the music, wich is great, what can hvae been the inspiration for that?

From this site:

And also:

Don’t know about the music, sorry.

Ah. Found something. The original videogame music and effects was the work of Japanese composer Koji Kondo:

Before Mario was Mario, he was Jumpman.