Apex domains cannot have CNAME records.
Question and response
Question
dig jazzimprovisation-video.com. NS
Answer
jazzimprovisation-video.com. 4 NS ns2.jazzimprovisation-video.com.
jazzimprovisation-video.com. 4 NS ns1.jazzimprovisation-video.com.
Authority
The response has no authority records.
Additional
ns1.jazzimprovisation-video.com. 4 A 5.79.92.213
ns2.jazzimprovisation-video.com. 4 A 5.79.92.210
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0