"Thanks for picking us up, Rod," Ashley said. "Don't mention it," seventeen-year-old Rodney Choy replied. He worked for Headquarters, too. Rod drove the girls wherever they needed to go. "Looks like we have a big problem," Rod went on. "Someone is messing with music broadcasting all across the country." "Tell us about it." Mary-Kate groaned. "We can't get any music on the radio except some horrible song by Capital D."
"If you ask me," Quincy said, "Capital D is a Capital Dork!" "I hope we can take care of this mission fast," Ashley said. "Mary-Kate and I have a big science test coming up." "What is it on?" Rod asked. "Sound," Ashley replied.
"I know tons of facts about sound," Quincy said. "Sound travels in waves through the air at different levels." "Those levels are called frequencies, right?" Mary-Kate asked. "Right," Quincy said.