Secret Songs...
	Timeline Song Pictures...

If done correctly, the start ring will be red (which is blue if playing a normal song).

Song	How to unlock
CONFLICT	Chapter R: Tap 13 times the word 'conflict'.
CYTUS ALIVE SONGS	Chapters 1-10: On the chapter selection screen, press the green (for easy) or red (for hard) song count indicators.
ENTRANCE (two songs)	Chapter 2: Slide the shade of either left or right wing towards the center. Left wing for Ver. A, right for Ver. B.
FIRST GATE	Chapter 9: Tap on the words 'FIRST GATE', the word 'OVERDRIVE' will appear in red.
L (two songs)	Chapter 7: Press and hold the big letter 'L', wait until it turns red, when you can play ver. A (or blue for ver. B).
MUSIC. THE ETERNITY OF US	Chapter K: Clear "Where you are not". Song is unlocked permanently.
PRECIPITATION	Chapter 2: Slide 2 fingers down between the title. Repeat for hard mode.
SAIKA	Chapter 3: Tap the 2 Japanese characters until it turns blue. Tap center to start. Repeat for hard mode.
SLIT (two songs)	Chapter 8: Slide diagonally down/left or diagonally down/right ('SLIT O' or 'SLIT I').
VERVERG	Chapter 1: Wait for the candlelight to turn orange then tap. Repeat for hard mode.
WHERE YOU ARE NOT	Chapter K: Play through all songs in Chapter K. The song will be permanently unlocked.

When viewing the song picture for any Timeline chapter songs, if you tap the girls they will disappear, allowing you to see the whole background scene for that particular song.