I just found this book that one can download for free. It's from a Hungarian woman who learned 16 languages after she got her PhD in Chemistry.
Polyglot: How I Learn Languages by KATÓ LOMB.
Susanna Zaraysky learned foreign languages like music. She's written a book, Language is Music, with tips on how to learn foreign languages using music and the media. Thanks to music, she speaks seven with perfect or almost perfect accents! She's a guest blogger at Leximo.