Melanie has a devoted fan base, many of whom are in the UK or the rest of Europe, and you can find most of her songs on a couple of websites. She also has her own Site with details of her tours etc. I can thoroughly recommend a listen to her more recent songs, as opposed to sticking with "Brand New Key" and "Look W T D T M S"
You'll find the chords you want here:-
Look What.... Chords
This is a Dutch fan's collection.

Melanie's own page is here:-

Melanie's Home Page

I do think that you should try "They Can Find You in Your Dreams" or "I Tried to Die Young" as well though!

Cheers
Dave