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116 GREGORIAN CHANT
occurs it is definitely post-classical and not always very fortunate, as
may be seen in the case of the Communio 'Factus est repente' of
Whitsunday, adapted in the thirteenth century to the 'Quotiescumque'
of Corpus ChristL In the Introit the first and third modes are the
most frequent, in the Communio (the shortest chant of the Mass) the
first and eighth:
Ex.38 (a) 1
m Introit .
Exsur-ge, quare obdormis Domine? exsur- ge, et ne repellas in fi-nem: quare
faciemtu-amavertis.obli-vi.sceristribulati-o.nem nostram? Ad-hae-sit in ter ra
venter nosten exsurge, Domine, ad juvanos.et li-be-ra nos. fs. Deus, auribus
It s-
nostris audivimus: patres nostri annuntUa-verunt no-bis. Gloria Patri.
C.A
u o u a e.
Ex - sur qua
Ex- sur- - ge, et ne re - pel
fi - nem: qua -
- re ob-dor - mis Do - mi-ne?
- las in
r$ fa - ci - em tu - am a ver - tis,
ob - li - vi see - ris tri - bu - la - ti - o
1 Graduate Vaticanum, p. 61.