71 & 72 have a very different flavor from 73-74.
Let's take a look at a few shows to contrast:
Set I Bertha, Me & My Uncle, Sugaree, Beat It On Down The Line, Cumberland Blues, Tennessee Jed, Black Peter, Jack Straw, Big Railroad Blues, Brown Eyed Women, Mexicali Blues, Comes A Time, Playin' In The Band, One More Saturday Night, Casey Jones
Set II Truckin', Ramble On Rose, Me And Bobby McGee, Brokedown Palace, Cryptical Envelopment-> Drums-> The Other One-> Cryptical Envelopement-> Wharf Rat, Sugar Magnolia, Uncle John's Band-> Not Fade Away-> Goin' Down The Road Feelin' Bad-> Not Fade Away
first "Tennessee Jed" - first "Jack Straw" - first "Mexicali" - first "Comes A Time" - first "Saturday Night" - first "Ramble On"
Set I Promised Land, Row Jimmy, Black Throated Wind, Deal, Me & My Uncle, Sugaree, Looks Like Rain, Loose Lucy, Mexicali Blues, Brown Eyed Women, El Paso, Here Comes Sunshine, Playin' In The Band
Set II China Cat Sunflower-> I Know You Rider, Jack Straw, They Love Each Other, Truckin'-> Eyes Of The World-> China Doll, Big River, Ramble On Rose, Box Of Rain, Wave That Flag, Sugar Magnolia, Uncle John's Band, Around & Around, E: Casey Jones
First Performances of: Row Jimmy, Loose Lucy, H.C.Sunshine, T.L.E.O., Eyes of the World, China Doll, Wave That Flag;
IMO, 73-74 brought rockin' R&B back to the GD. If you know the 73 shows of TLEO you'll know it is a rockin' R&B beat. "Round & Round, WOO! Round & Round... "
Conversley, 71 & 72 were more country-like very Workingman's.
Damn do I love me a HCS.