Menuhin was playing Bach on a fantastic spiritual level when he was a teenager.
I've learnt new scales through playing different types of music, like Indian raga scales, gipsy scales and harmonically-based jazz scales.
The Beatles are a classical group because they're classic.
You can't learn pathos or profundity.
If you do the same thing every night, that's the death of music.
Even if you're playing Brahms or a Beethoven concerto, you've got to have a different vantage point, slightly, each time.