Boil the Frog is a sweet looking mixtape creator:
Boil the Frog lets you create a playlist of songs that gradually takes you from one music style to another. It’s like the proverbial frog in the pot of water. If you heat up the pot slowly enough, the frog will never notice that he’s being made into a stew and jump out of the pot. With a Boil the frog playlist you can do the same, but with music. You can generate a playlist that will take the listener from one style of music to the other, without the listener ever noticing that they are being made into a stew.
Not bad checking out U2 to Johnny Cash.