A list of the 100 best, most unforgettable, popular songs from the Showa Era was announced.
You already learned that 歌謡 means "song," so when you add music to that it becomes a super popular song. It's not just a song anymore. It's in everything you hear!
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.