This was a weird year for the charts. The strongest song of the year never hit #1 in 1977, because Rod Stewart peaked in November '76 with his "Tonight's The Night" and carried sales for months into '77. My vote therefore goes to one of the BeeGees for the "Hit of the Year"
1977 - The top hits month by month
The HITThe ArtistThe LabelThe time it peaked
You Don't Have To Be A Star (To Be In My Show)Marilyn McCoo & Billy Davis, Jr.ABCJanuary
You Make Me Feel Like DancingLeo SayerWarner BrothersJanuary
I WishStevie WonderTamlaJanuary
Car WashRose RoyceMCAJanuary
Torn Between Two LoversMary McGregorAriola AmericanFebruary
Blinded By The LightManfred Mann's Earth BandWarner BrothersFebruary
New Kid In TownThe EaglesAsylumFebruary
EvergreenBarbra StreisandColumbiaMarch
Rich GirlDaryl Hall & John OatesRCAMarch
Dancing QueenAbbaAtlanticApril
Don't Give Up On UsDavid SoulPrivate StockApril
Don't Leave Me This WayThelma HoustonTamlaApril
Southern NightsGlen CampbellCapitolApril
Hotel CaliforniaThe EaglesAsylumMay
When I Need YouLeo SayerWarner BrothersMay
Sir DukeStevie WonderTamlaMay
I'm Your Boogie ManK.C. & The Sunshine BandT.K.June
DreamsFleetwood MacWarner BrothersJune
Got To Give It Up (pt 1)Marvin GayeTamlaJune
Gonna Fly Now (Theme from "Rocky")Bill ContiUnited ArtistsJuly
Undercover AngelAlan O'DayPacificJuly
Da Doo Ron RonShaun CassidyWarner Brothers/CurbJuly
Looks Like We Made ItBarry ManilowAristaJuly
I Just Want To Be Your Everything Andy GibbRSOAugust
Best Of My LoveThe EmotionsColumbiaSeptember
Star Wars Theme/Cantina BandMecoMilleniumOctober
You Light Up My LifeDebby BooneWarner Brothers/CurbNovember
How Deep Is Your LoveBee GeesR.S.O.December