(R) - means Rumour - i.e. not officially confirmed or heard:

TOUCH ERA

Don't Look Back
Don't You Break My Heart
Fly Fly Fly (R)
Give Good Feeling (R)
I Don't Wannbe
Is This Love
I Want You I Need You
Melody Of Life
Sugar & Spice
Take Me Away
Walking On Air
We're Gonna Make It Happen

SPICE ERA

C.U Next Tuesday (Likely Story)
Do You Think About Me?
Feed Your Love
Just One Of Those Days (R)
Perfect Vision
Walking On Air

SPICEWORLD ERA

Are You My Friend? (R)
Boyfriend / Girlfriend (Recorded for Blackstreet Album but never released)
Can't Stay Tonight
Dingeling (R)
Image And Likeness (R)
lLeader Of The Gang (R)
Seven Days (R)

FOREVER ERA

Go Go Go (R)
Overnight (R)
Right Back Atcha (Pop Version)
Treasure (R)
Woman

GREATEST HITS ERA

Angels
Spice Is Back

OTHER

Free Your Mind (R)
If Ya Do (R)
Overnight (R)