My working definition of a Katrina is a song that appears in 20% or more of all sets, but I don't count dupe classics twice. Below are the scores for this set, based on 31 sets from 1990. If I *did* count dupe sets, then World Party, Jane's Addiction & Jellyfish would all be fully fledged Katrinas & Eric Johnson & Blues Traveler would be on the cusp.
World Party - "Way Down Now" - 6 - 19.4%
Jane's Addiction - "Been Caught Stealing" - 6 - 19.4%
John Farnham - "You're The Voice" - 4
Jellyfish - "The King Is Half Undressed" - 6 - 19.4%
Don Henley - "The Heart Of The Matter" - 1
Eric Johnson - "Cliffs Of Dover" - 5 - 16.1%
Paul Simon - "Born At The Right Time" - 2
Michael Penn - "No Myth" - 10 - 32.3%
Blues Traveler - "But Anyway" - 5 - 16.1%
Del Amitri - "Kiss This Thing Goodbye" - 8 - 25.8%