MEDIABASE (DUCKHEAD/popradiotop20.com) TOP SINGLES FOR 2009*

https://www.youtube.com/watch?v=oUbpGmR1-QM&ab_channel=JaySeanVEVO

No. Song-Artist-Peak Month
  1 DOWN-JAY SEAN & LIL WAYNE-OCTOBER
  2 YOU BELONG WITH ME-TAYLOR SWIFT-September
  3 BOOM BOOM POW-THE BLACK EYED PEAS-May
  4 I GOTTA FEELING-THE BLACK EYED PEAS-August 
  5 WHATCHA SAY-JASON DERULO-November
  6 GIVES YOU HELL-THE ALL-AMERICAN REJECTS-March
  7 POKER FACE-LADY GaGa-March
  8 RIGHT ROUND-Flo Rida-April
  9 USE SOMEBODY-Kings Of Leon-October
 10 JUST DANCE-Lady Gaga & Colby O'Donis-January
 11 My Life Would Suck Without You-Kelly Clarkson-March
 12 Replay-Iyaz-December
 13 Party In The U.S.A.-Miley Cyrus-October
 14 Waking Up In Vegas-Katy Perry-August
 15 Don't Trust Me-3oh!3-July
 16 Circus-Britney Spears-February 
 17 Womanizer-Britney Spears-January 
 18 Lovegame-Lady Gaga-July
 19 Love Story-Taylor Swift-February
 20 Knock You Down-Keri Hilson,Kanye West & Ne-Yo-August
 21 Paparazzi-Lady Gaga-November
 22 Halo-Beyonce-June
 23 Sober-P!nk-March
 24 Second Chance-Shinedown-June
 25 Fireflies-Owl City-December
 26 You Found Me-The Fray-April
 27 Sweet Dreams-Beyonce-October
 28 I Know You Want Me (Calle Ocho)-Pitbull-June
 29 3-Britney Spears-December
 30 Heartless-Kanye West-March
 31 Dead And Gone-T.I. & Justin Timberlake-April
 32 Single Ladies (Put a Ring On It)-Beyonce-January
 33 Good Girls Go Bad-Cobra Starship & Leighton Meester-September
 34 Battlefield-Jordin Sparks-August
 35 Already Gone-Kelly Clarkson-December
 36 Blame It-Jamie Foxx & T-Pain-May
 37 Kiss Me Thru The Phone-Soulja Boy Tell'Em & Sammie-May
 38 Please Don't Leave Me-P!nk-July
 39 Fire Burning-Sean Kingston-August
 40 The Climb-Miley Cyrus-June
 41 How Do You Sleep?-Jesse Mccartney & Ludacris-May
 42 If U Seek Amy-Britney Spears-May
 43 I Do Not Hook Up-Kelly Clarkson-June
 44 Love Drunk-Boys Like Girls-October
 45 Right Now (Na Na Na)-Akon-January
 46 No Surprise-Daughtry-September
 47 Meet Me Halfway-The Black Eyed Peas-November
 48 Best I Ever Had-Drake-August
 49 Obsessed-Mariah Carey-October
 50 Run This Town-Jay-Z,Rihanna & Kanye West-October 
 51 I Hate This Part-The Pussycat Dolls-February
 52 Mad-Ne-Yo-March 
 53 Love Lockdown-Kanye West-January
 54 Untouched-The Veronicas-February
 55 Beautiful-Akon,Colby O'Donis & Kardinal Offishall-April
 56 Hotel Room Service-Pitbull-September
 57 She Wolf-Shakira-September
 58 If Today Was Your Last Day-Nickelback-July
 59 Never Say Never-The Fray-September
 60 Birthday Sex-Jeremih-July
 61 Goodbye-Kristinia Debarge-June 
 62 One Time-Justin Bieber-November
 63 Love Sex Magic-Ciara & Justin Timberlake-April
 64 Evacuate The Dancefloor-Cascada-December
 65 Day 'N' Nite-Kid Cudi-June
 66 Sugar-Flo Rida & Wynter-May
 67 Fallin' For You-Colbie Caillat-July 
 68 That's Not My Name-The Ting Tings-August
 69 Be On You-Flo Rida & Ne-Yo-October
 70 Thinking Of You-Katy Perry-March
 71A Not Meant To Be-Theory Of A Deadman-September
 71B Say Hey (I Love You)-Michael Franti,Spearhead & Cherine Anderson
 73A Crack A Bottle-Eminem,Dr. Dre & 50 Cent-February
 73B Green Light-John Legend & Andre 3000
 73C Light On-David Cook-February

*  Here is how Duckhead calculated this chart from Radio and Record charts.

Points
Points for the yearly charts are calculated using inverse points from the weekly charts.
Each week, the # 1 song gets 20 points, the # 2 song gets 19 points, # 3 gets 18, and so on.
The # 20 song gets 1 point.
Each song's points are added up for each week to reach the total.
A song's entire chart run will be used for the yearly chart.
Songs appear on the yearly chart corresponding to the year they peak on the weekly charts.
Tie-Breakers
For songs that tie in points on the yearly charts, the following tie-breakers are used:
1. Most weeks at # 1
2. Most weeks at # 2
3. Most weeks at # 3
4. Most weeks at # 4
5. Etc.
If songs remain tied after all 20 tie-breakers, then they will be listed as tied on the yearly chart.
Tied songs appear in alphabetical order, and are marked by letters, for example: 99A and 99B.