The way an iPod Shuffle works, is it randomly picks the next song so you have no idea what the next song will be.
The different genre that you have are rock from the 60s which includes Rolling Stones, Beatles, and Bob Dylan country includes Faith Hill and Taylor Swift rock of the 90s includes U2 and Mariah Carey Reggae includes Bob Marley and Bunny Wailer rock of the 70s includes Elton John and Led Zeppelin and bluegrasss/rock includes Dave Mathews Band. Suppose you have an iPod Shuffle with the following songs on it: 5 Rolling Stones songs, 7 Beatles songs, 9 Bob Dylan songs, 4 Faith Hill songs, 2 Taylor Swift songs, 7 U2 songs, 4 Mariah Carey songs, 7 Bob Marley songs, 6 Bunny Wailer songs, 7 Elton John songs, 5 Led Zeppelin songs, and 4 Dave Mathews Band songs.