Free! RHYME 'N LEARN utilizes hip-hop beats and mnemonics to convey a number of fairly complex math and science topics. Most topics are presented via YouTube with Khan-like explanations. The musical production is on par with today's Top 40 and the lyrics are accurate but young hip-hop heads will probably not be impressed with the lyrical delivery. We see it as an open invitation for them to memorize and perform the raps to their own liking!