Diatonic Triads in Major

Please add the symbols or names you use for the following diatonic chords in major keys. Include explanation, name of system, and/or country of origin if appropriate.


 * C: .... I .............. V ............. IV ........... | .....  vi ............. iii ..............  ii .............  | ...  viio


 * C: .... T .............. D ............. S ........... | .....  Tp ............. Dp ...........  Sp ............  | ...  /D7


 * C: .... tonic ...... dominant.. subdominant | submediant . mediant ... supertonic .....  | ...  leading-tone