I am a hobby musician myself, I play the trumpet (a bit) and I sing quite a lot. I played in a brass band when I was little - so I read sheet music. Which means it didn't take me long to find out how music piece #1 goes... and it's quite famous, I just couldn't find out which piece it was. A colleague of mine said he thought it must be from an opera, and he was right - I've just not managed to find out which. Until I realised that car #1 was a 1957 Cadillac Eldorado Seville... then things started to dawn on me.
Music piece #1 is a page from Gioachino Rossini's "The Barber of Seville". Of course...