Apex domains cannot have CNAME records.
Question and response
Question
dig indie-music-network.com. NS
Answer
indie-music-network.com. 5 NS ns-1689.awsdns-19.co.uk.
indie-music-network.com. 5 NS ns-641.awsdns-16.net.
indie-music-network.com. 5 NS ns-1099.awsdns-09.org.
indie-music-network.com. 5 NS ns-1189.awsdns-20.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0