Very well written account of the history of Einstein's last unconfirmed hypothesis: gravity waves. He postulated that they would be small but detectable and strangely enough be in the audio frequency range.
This book is lots of fun and gives an insider account of the still unfinished search for these waves. From the foibles of Joseph Weber's first mistaken reports of gravity wave detection to the construction of the massive $365M LIGO detector.
http://www.amazon.com/Einsteins-Unfinished-Symphony-Listening-Space-Time/dp/0425186202/ref=pd_rhf_p_1/102-2845328-8416163
