| Sinclair Lewis's "___ Vickers" | 44 |
| Sinclair Lewis's Judge Timberlane | 37 |
| Sinclair Lewis's Pulitzer novel | 35 |
| Sinclair Lewis's ___ Timberlane | 35 |
| Sinclair who wrote "The Jungle" | 41 |
| Sinclair's "World's ___" | 42 |
| Sine qua non at an afternoon affair | 35 |
| Sine's reciprocal, in trig: abbr. | 37 |
| Sing ''nyah-nyah'' to | 37 |
| Sing ''shooby-doo,'' e.g. | 41 |
| Sing "Bye Bye Birdie," e.g. | 37 |
| Sing "Gladly the cross-eyed bear," say | 48 |
| Sing "K-K-K-Katy," say | 32 |
| Sing "The Lonely Goatherd," say | 41 |
| Sing "The Moon Got in My Eyes," e.g. | 46 |
| Sing again, as for a show finale | 32 |
| Sing like Andy Williams or Russ Columbo | 39 |
| Sing loudly, with "out" | 33 |
| Sing on-key with a seasoned twist? | 34 |
| Sing to a lover, or the song itself | 35 |
| Sing ___ Daily, major Hong Kong newspaper | 41 |
| Singapore and the Vatican City, e.g. | 36 |
| Singapore's prime minister Lee ___ Loong | 44 |
| Singer "from the block," familiarly | 45 |
| Singer Aguilera, self-referentially | 35 |
| Singer Al who starred in the first talkie | 41 |
| Singer and actor moored together | 32 |
| Singer and chef make a family portrait? | 39 |
| Singer approaches N.Y.C. midtown oasis | 38 |
| Singer at "heaven's gate" | 39 |
| Singer at Barack's inauguration | 35 |
| Singer at Charles and Diana's wedding | 41 |
| Singer at McCartney's Gershwin Prize concert | 48 |
| Singer at Obama's 2009 inauguration | 39 |
| Singer backed by the Spiders From Mars | 38 |
| Singer Basil who had the hit "Mickey" | 47 |
| Singer Basil with the #1 hit "Mickey" | 47 |
| Singer being treated for anxiety? | 33 |
| Singer Bill . . . or a singing performance | 42 |
| Singer Bill known as the Cowboy Rambler | 39 |
| Singer Björk's birthplace | 32 |
| Singer Bobby portrayed by Kevin Spacey | 38 |
| Singer born Eithne Nà Bhraonáin | 37 |
| Singer born Eithne Patricia Nà Bhraonáin | 46 |
| Singer born Helen Porter Mitchell | 33 |
| Singer born in Lubbock, Texas in 1935 | 37 |
| Singer Brickell who's married to Paul Simon | 47 |
| Singer called 'Queen of the Blues' | 42 |
| Singer called "The Jezebel of Jazz" | 45 |
| Singer called "The Little Sparrow" | 44 |
| Singer called the "Godmother of Punk" | 47 |
| Singer called the Texas Troubadour | 34 |
| Singer Carly Jepsen's middle name | 37 |
| Singer Case of the New Pornographers | 36 |
| Singer Charles's book about healthy eating? | 47 |
| Singer Cochran unearthed in the food pyramid? | 45 |
| Singer covering "Purple Haze," probably | 49 |
| Singer depicted on the Australian $100 note | 43 |
| Singer dubbed "King of Soul" | 38 |
| Singer dubbed "the voice of Ireland" | 46 |
| Singer Emmylou drank too much coffee? | 37 |
| Singer Erykah who had a son by Andre 3000 | 41 |
| Singer Faith married to actor Jim? | 34 |
| Singer famous for her wide vocal range | 38 |
| Singer fired by Godfrey on television in 1953 | 45 |
| Singer formerly of the group Clannad | 36 |
| Singer Frankie got the pole position? | 37 |
| Singer Gene who should never be forgotten? | 42 |
| Singer given a 1999 National Medal of Arts | 42 |
| Singer Green with multiple Grammys | 34 |
| Singer Griffith with the album "Flyer" | 48 |
| Singer Guthrie and street skater Eisenberg | 42 |
| Singer Helen who sounds prepared | 32 |
| Singer Hendryx who co-founded Labelle | 37 |
| Singer honored on a 2008 U.S. postage stamp | 43 |
| Singer Iglesias 31. Fourth-down plays | 37 |
| Singer in 1977's Best Picture | 33 |
| Singer in a fatal plane crash on February 3, 1959 | 49 |
| Singer in an interrogation room? | 32 |
| Singer in Bob Dylan's Rolling Thunder Revue | 47 |
| Singer in the "Lady Marmalade" remake | 47 |
| Singer in the "Odyssey" | 33 |
| Singer in the Gaming Hall of Fame | 33 |
| Singer Irene who won a 1983 songwriting Oscar | 45 |
| Singer Isaac who cowrote "Soul Man" | 45 |
| Singer Jack of "Louie, Louie" fame | 44 |
| Singer Jackson with more than 20 #1 country hits | 48 |
| Singer Jane Siberry's new name, as of 2006 | 46 |
| Singer Janelle with "Tightrope" | 41 |
| Singer Jett with the Blackhearts | 32 |
| Singer Joan with The Blackhearts | 32 |
| Singer Joey with the 60's Starliters | 40 |
| Singer John from punk legends X, appropriately | 46 |
| Singer John with "Missing You" | 40 |
| Singer Johnny's auto care product? | 38 |
| Singer Jones whose father is Ravi Shankar | 41 |
| Singer Kay of "Stop the Music" | 40 |
| Singer known as "La Divina" | 37 |
| Singer known as "The Velvet Fog" | 42 |
| Singer known as "The Voice" | 37 |