The suggested assignments for each Mass in the Vatican Kyriale for the TLM are given in the following (1962 revisions in brackets).

Some are based in long-standing practice (Masses I and IX), but you are probably aware that these are only suggestions, and that you are free to "mix and match" among the various parts of each mass: "This Ordinary is NOT meant to be a matter of hard and fast rule: chants from one Mass may be used together with those from others, the Ferial Masses [XVI and XVIII] excepted. In the same way, in order to add greater solemnity, one or more of the following 'Chants ad libitum' may be employed" (Liber Usualis, p. 78).

I - Paschal Time
II, III - Solemn feasts [1st class]
IV - VIII - Doubles [2nd class]
IX, X - Feasts of Our Lady
XI - Sundays throughout the year
XII, XIII - Semidoubles [3rd class]
XIV - Within octaves, except of Our Lady [3rd class]
XV - Simples [Commemorations and ferias of the Christmas season]
XVI - Ferias thoughout the year [The Ite missa est may be used ad libitum for any mass]
XVII - Sundays of Advent and Lent
XVIII - Ferias of Advent and Lent, Vigils Days, Ember Days Rogation

No assigments are given for the Credos, although a note at the end of Credo I states: "This is the authentic tone for the Credo, but the following tones may be used where it is customary."

The 1974 Graduale has the following designations only:

I - Paschal Time (with additional Kyries for Sundays and of Feasts and Memorials)
IV - Feasts of the Apostles
IX - Solemnities and Feasts of Our Lady
X - Feasts and Memorials of Our Lady
XI - Sundays throughout the Year
XVI - Ferias throughout the year
XVII - Sundays of Advent and Lent
XVIII - Weekdays of Advent and Lent, and Masses for the Dead (the latter having its own Kyrie)

The note after Credo I above is retained.