The ".ab" is silent when you pronounce the name of this alternative rock band from Hokkaido, Japan. I once heard them described as "a great Jrock* band with a touch of Radio Head." Feeling Sleepy.ab yet? Just give a listen, you will.
*That's Japanese rock. You can add a "J" to just about anything and make it Japanese. There's Jpop, Jblogs, JLeno, etc., etc, Jetc.