m2 Jaws
M2 Happy Birthday
m3 Greensleeves
M3 Kumbaya
P4 here Comes the Bride
TT Maria
P5 Twinkle Twinkle
m6 We are Young
M6 NBC
m7 Star Trek
M7 Take me on
P8 Somewhere Over the Rainbow
Fixed Do ( used in a lot of the European countries ) where they actually use the sol-fa note names to identify notes rather than letter names (C-D-E etc.) So this means the note names remain the same regardless of the key that is being played.
An old professor told me fixed Do was helpful for producing musicians with perfect pitch, however that is not my goal when teaching solfege.
Movable Do where Do is always the tonic. For example, in C major, C is do; in D major, D is do; in E-flat minor, E-flat is do, and so on. And the sol-fa syllables always stay the same when going from one key to the next regardless if there are sharps or flats.