Vibrato across octave of Range

The same long held vibrato phrase, across all 12 keys, practice from the bottom and work your way up

Original Key C5 in chest with vibrato (Pavarotti)
-1 – B4
-2 – Bb4
-3 – A4
-4 – Ab4
-5 – G4
-6 – Gb4
-7 – F4
-8 – E4
-9 – Eb4
-10 – D4
-11 – Db4
-12 (Octave Lower than original, C4 Note)