Apex domains cannot have CNAME records.
Question and response
Question
dig bigbmusic.com. NS
Answer
bigbmusic.com. 5 NS ns-22.awsdns-02.com.
bigbmusic.com. 5 NS ns-1768.awsdns-29.co.uk.
bigbmusic.com. 5 NS ns-979.awsdns-58.net.
bigbmusic.com. 5 NS ns-336.awsdns-42.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0