Cool! What would it take to put one of those things in the trunk of my
low-rider with the tinted windows?

Rob Adelman wrote:
http://www.cnn.com/2003/TECH/space/09/10/blackhole.music.reut/index.html

WASHINGTON, Sept 9 (Reuters) -- Big black holes sing bass. One
particularly monstrous black hole has probably been humming B flat for
billions of years, but at a pitch no human could hear, let alone sing,
astronomers said this week.