Skylar Grey FilmSkylar Grey is one of the many artists with a song featuring Big Sean

Skylar Grey - 'Back From The Dead'

Skylar Grey is easily one of the best female vocalists around, and over the years, she's built up a pretty nice resume. She's notched three top ten singles as a guest vocalist and a top ten selling album, too. But where her success really takes place is in that top selling album, Don't Look Down. Released last year, Don't Look Down is a great pop record, and one of the standouts is 'Back From The Dead.' It features Blink-182's Travis Barker on the drumkit, too, so his beats supporting Grey's vocals and Big Sean's bars just make the track that much stronger. I wonder how close Barker and Sean are. Future collaboration for the new Blink album? We can only dream.

More: Four things we want from a new Blink 182 album

Justin Bieber - 'As Long As You Love Me'

'As Long As You Love Me' may as well be Big Sean's holy grail when it comes to his guest spots, both commercially and musically. It hit six on Billboard's Hot 100 and three on the Mainstream Top 40, but the best part about it is that it just doesn't get old. Justin Bieber may be going through a rough patch these days, but Believe was a pretty great album. Big Sean was also on Bieber's Journals track, 'Memphis.' It wasn't as good, but it wasn't bad either. Point is, it wouldn't surprise anyone if they got together again and put out another gem in the future.