The chorus shifts energy upward. It ascends into the 6 and 7 holes, demanding confident airflow. This is the part of the tune everyone sings along with, so your pitch center must stay true.
Chorus Opening:
6 6 -6 6 -5 5
(Coun-try roads, take me home)
Second Phrase:
6 -6 6 5
(To the place)
5 -4 4
(I be-long)
The High Hook:
6 -6 7 -6 6
(West Vir-gin-ia)
6 -6 6 5
(moun-tain ma-ma)
Resolution:
5 -4 4
(Take me home)
4 -4 4
(coun-try roads)
The jump to 7 blow on "West" is the melodic apex of the chorus. Resist the urge to blow harder on hole 7; higher brass reeds need less air volume, not more. Overblowing hole 7 will choke the reed and push the pitch sharp.