Bart Hopkin is a builder of experimental musical instruments and a writer and publisher on the subject. Hopkin runs the website windworld.com, which provides resources regarding unusual instruments. Hopkin published the magazine Experimental Musical Instruments for 15 years and published several books and CDs specialized in a specialisation of certain types of instruments, such as wind chimes, plosive aerophones and marimbas. For these publications, Hopkin regularly asks experts on the subject to co-write the books, such as for the book about how to build and tune marimbas. Getting a Bigger Sound is a book Bart Hopkin wrote with Robert Cain and Jason Lollar about amplification of sound sources with several types of pickups ranging from piezo disc pickups to common pickups often used in el