To unlock the secret notes, you must play all of the songs on the disc by the artists the secret notes correspond to, scoring 4 or more stars in either Career or Quickplay mode.

Note	Hint
Secret Notes 1	Hint: *e*** *c*****y. (Jesse McCartney)
Secret Notes 2	Hint: **n** ***k***. (Janet Jackson)
Secret Notes 3	Hint: *** *ol**** ****e*. (The Rolling Stones)
Secret Notes 4	Hint: **l* *ll**. (Lily Allen)
Secret Notes 5	Hint: A** * A*. (Aly & Aj)
Secret Notes 6	Hint: ***o*n 5. (Maroon 5)
Secret Notes 7	Hint: **v** *o***. (David Bowie)
Secret Notes 8	Hint: *v***s***c*. (Evanescence)
Secret Notes 9	Hint: H*****. (Hinder)
Secret Notes 10	Hint: *a* B****a*. (Pat Benatar)
Secret Notes 11	Hint: *o ***b*. (No Doubt)
Secret Notes 12	Hint: ***v** **y*. (Marvin Gaye)
Secret Notes 13	Hint: **i** *i***. (Spice Girls)
Secret Notes 14	Hint: **ll*** ****l*. (Village People)
Secret Notes 15	Hint: **l*** **ff. (Hillary Duff)
Secret Notes 16	Hint: *e***w***d. (Yellow Card)
Secret Notes 17	Hint: *h* *ll-**e***** **j****. (The All-American Rejects)
Secret Notes 18	Hint: **y O*****. (Roy Orbison)
Secret Notes 19	Hint: **r* **u****. (Carl Douglas)