Just about every major pop artist is looking at having a major release in 2016.

We've already had Beyonce's Lemonade and Rihanna's Anti, Justin has just release his new single "Can't Stop The Feeling!", Britney is teasing her new album due for release this summer, while others like Katy Perry, Christina Aguilera and more are gearing up for their comebacks.

So here's a look back over some of the world's biggest pop stars, and the best songs they've recorded that, for whatever reason, they didn't release as singles, and might have passed you by.

Beyonce - "Keep Giving Your Love To Me"

The way Beyonce releases her albums now, it's almost impossible to NOT know every single song that she's been putting out. In order to find one, you have to go all the way back to 2003, and Beyonce has just released her debut album Dangerously In Love, but you won't even find the track on there. No, the song in question actually appeared on the soundtrack to that summer's big blockbuster Bad Boys II, with production by none other than Sean "P. Diddy" Combs.

Justin Timberlake - "FutureSex/LoveSound"

The opening and title (except for missing that last 'S') track of his 2006 sophomore album was overshadowed by lead single "SexyBack", but it is arguably even better and, get this, sexier than that track. Produced by Timbaland and Danja, and the song garnered comparisons to everyone from Prince and David Bowie to Nine Inch Nails and Michael Hutchence. It literally couldn't get much further away when compared to his current single "Can't Stop The Feeling!"

Britney Spears - "Get Naked (I Got A Plan)"

2007's Blackout album coincided with Brit's very public meltdown, but the album is actually one of the best pop albums of the millennium so far (and we're not the only ones who think so), and "Get Naked (I Got A Plan)" is it's crowning, glorious centrepiece. Produced by Timbaland protege Danja, the track is still so futuristic and forward-sounding, that even if she were to release it today, it would still sound ahead of it's time.

Lady GaGa - "Scheiße" 

Despite wanting to release it as a single from her 2011 album Born This Way, GaGa told her fans that her label disagreed with her, and we got the lesser "Judas" cut instead. "Scheiße" was produced by RedOne ("Bad Romance", "Just Dance"), and was influenced heavily from her visit to Berlin-based super-nightclub The Laboratory. After her sojourn into jazz with Tony Bennett on 2014's Cheek To Cheek, GaGa is reportedly back in the studio with RedOne working on her next album. More "Scheiße", please!

Nicki Minaj - "The Crying Game" featuring Jessie Ware

While her haters will say that she's all show and no depth, you don't have to look very far into her CV to find just how deep Minaj is willing to get. In 2014, The Pinkprint was launched off the back of "Anaconda", but this bracing cut about domestic abuse was painfully real, and Minaj's raps melt seamlessly into her own soulful bridges, which then disappear into Jessie Ware's haunting chorus delivery.

Justin Bieber - "Roller Coaster" 

Okay, yes, it was technically released as something of a single from his "what exactly is this?" compilation album Journals in 2013, but so did just about every song on there, so we're not counting it. Anyway, it was produced by Darkchild (Destiny's Child, Whitney Houston, Janet Jackson), who gives the Biebz a very 90's R'n'B beat to play around with. Of course, JB went off and found Diplo and Skrillex and now he's too cool from 90's skool, even though it suits him perfectly. Ah well.

Rihanna - "Cold Case Love"

If any of the songs on 2009's Rated R album are to do with Rihanna's relationship with Chris Brown (and the then recent physical assault case), then this is it. Co-written and co-produced by Justin Timberlake, the epic-length ballad finds Rihanna taking apart an extremely broken relationship. Like Minaj's "The Crying Game", its proof of an artist not given enough credit for opening their hearts musically for all the world to see, with spine-tingling results.