1.Depends on the wedding I guess. i would 9/10 times play to the dance floor, just like any other wedding. The last thing other guests want is for conversation to be drowned out, and be forced outside (may be cold). I find setting up right next to the dancfloor or speakers close by helps. :)
2. Yes background is good, but they can come in very handy, especially with a tired number of guests. My wedding last night needed a good 10-15 slow songs as it dies a death at 11.30.
3. I have one to go to right now (rushed post!). Ask them, not a question we can answer. :)
My one today is Mr Coby & Mr Brey, they may want "the happy couple" but more popular would just be their first names.
4. I would ask them how gay they want it to be, or you will get the idea if you meet them. 9/10 of my ones are not stereotypically gay as most gay people I have worked for hate the queeny type thing, although there are always a few gay hits in there. The first dance today is Barbara Streisand for example. They have banned Queen & Abba though, which says it all. There are tons of tracks if they do want gay music, my question would be "who are your guests". Most typically 80-90% will be family and straight friends. :)
See below for some of the tracks i have found.
5. just look online for "classic funk" you will find millions of compilation albums.
This took me about 5 seconds to find. Again ask the client as they may want a specific type of funk, or more commonly not funk at all, but soul etc. as they don't understand the genres.
Good luck.
Rick Astley - Never Gonna Give You Up 3:34
Bee Gees - Staying Alive 4:46
We Are The Champions 3:01 Queen
Bulletproof 3:26 La Roux Bulletproof - EP
Muma mia 3:32 Abba Abba Gold Greatest Hits
Never Forget 6:26 Take That Take That: Greatest Hits
Single Ladies (Put A Ring On It) - beyonce 3:13 Beyoncé Single Ladies (Put A Ring On It)
In For The Kill 4:08 La Roux Kitsuné: Maison Compilation 6
Elton John& Kiki Dee - Don't Go Breaking My Heart 4:33 Elton John
don't let the sun go down on me 5:38 Elton John
Killer Queen 3:02 Queen
Queen - Fat Bottomed Girls 4:17 Queen
I Want to Break Free 3:21 Queen The Works
Cant Get You Out Of My Head 3:52 Kylie Minogue
Love At First Sight 4:01 Kylie Minogue Fever
Ain't No Other Man 3:49 Aguilera, Christina
Scissor Sisters - I Don't Feel Like Dancing DONT 4:36
Take Your Mama 4:32 Scissors sisters
George Micheal Wham! - I'm Your Man 4:06
Dirrty 4:59 Christina Aguilera Stripped
Holiday - MADONNA 6:08 Madonna Madonna
madonna - like a virgin (extended dance remix) 6:06
Material Girl 3:53 Madonna
Diana Ross & The Supremes - I'm Coming Out 5:23
Karma Chameleon 4:02 Culture Club At Worst...The Best of Boy George and Culture Club
Young Hearts Run Free - Candi Staton - 4:03
ABBA - Dancing Queen 3:48
Bee Gees - You Should Be Dancing 4:18
Dirty Dancing - I've Had The Time Of My Life 4:50
Donna Summers - I Feel Love 8:14 Donna Summers
Pointer Sisters - I'm so Excited 3:49
The Village People -YMCA 4:48
dont stop me now 3:31 queen
ABBA - Gimme! Gimme! Gimme! 4:47
Relax - frankie goes to hollywood 3:57 Frankie Goes to Hollywood Welcome to the Pleasuredome
Vougue - Madonna 5:17
Go West 5:04 Pet Shop Boys
West End Girls 4:00 Pet Shop Boys Discography, The Complete Singles Collection (Compilation)
Blue Monday 7:24 New Order Smash Hits 30th Anniversary - The Eighties
I'm Too Sexy 2:50 Right Said Fred Up
soft cell- tainted love (single version) 2:40
Atomic 4:37 Blondie
Heart of Glass 4:32 Blondie
Communards - Don't Leave Me This Way (1) 6:28
Cindy Lauper - Girls Just Want To Have Fun 3:49
That's the Way I Like It 3:05 Kc & The Sunshine Band The Best Of KC & the Sunshine Band
80s - Wham - Wake Me Up Before You Go-Go 3:50
Careless Whisper 5:00 George Michael Ladies and Gentlemen, The Best of George Michael
Outside 4:43 George Michael Ladies and Gentlemen, The Best of George Michael
Free (Radio Edit) 3:51 Ultra Naté Ibiza - The Ultimate Clubbing Experience
Do You Really Want to Hurt Me 4:25 Culture Club The Best of Culture Club
You Make Me Feel (Mighty Real) 6:35 Sylvester Young Soul Rebels
Freed from Desire 3:30 Gala Big Tunes Old Skool
Danger! High Voltage 3:50 Electric Six Fire
Gay Bar 1:52 Electric 6
The Source ft Candi Staton - You got the love 3:34
South Pacific Soundtrack - There Is Nothing Like A Dame 3:38 South Pacific
80s - Bonnie Tyler - Total Eclipse Of The Heart 6:58
Shirley Bassey - Hey Big Spender 1 1:58
Pet Shop Boys - It's A Sin 5:01
In the Navy 5:40 Village People Go West In the Navy
I should be so lucky - kylie 3:27 Kyle Minogue Simply The Best of the 80's
Hot Stuff (Single Version) 3:50 Donna Summer The Journey - The Very Best of Donna Summer
Hooray for Hollywood 2:24 Nancy Sinatra California Girl
Hey Big Spender 2:07 Peggy Lee Capitol 5557
Heavy D & The Boys - Now That We've Found Love 4:16
Grease - Summer Nights 3:37
Grace Kelly 3:07 Mika
GERRY HALIWELL - Its Raining Men 3:23 <Unknown> <Unknown>
Finally 3:43 Ce Ce Peniston Girls (Box Set)
Erasure - A Little Respect 3:32
Elton John - I'm Still Standing 1 3:01 Elton John
Elton John - I Guess That's Why They Call It The Blues(1) 4:43 Elton John
Born This Way - lady gaga 4:21 Lady Gaga Born This Way
Bonnie Tyler - Holding out for a hero 5:50
Bette Midler - Forbidden Broadway - Who's Gay In Hollywood 2:58 Bette Midler
The Way It Used To Be 4:44 Pet Shop Boys Yes Special Edition
Better The Devil You Know 3:53 Kylie Minogue The Best Of Kylie Minogue
Borderline 4:00 Madonna Celebration