Trey Songz and Big Sean, along with a special surprise guest, delivered a memorable performance at The Theatre at Madison Square Garden in New York City last night (March 1). The show was part of Trey and Sean's nationwide, 18-city collaborative tour, the Anticipation 2our.

Besides the flock of predominately female fans in attendance, journalists/bloggers, record label executives and even fellow artists, like Ryan Leslie and Fabolous, were also in the house to show love to Trey and Big Sean. Once word spread that Loso was in the building and due to his relationship and collection of catchy collabos with Trigga, a guest appearance seemed inevitable.

And just like clockwork, while Trey was performing smash single “What I Be On,” sans the witty lyricist, the crooner requested the music be cut, calling on Fabo to join him on stage for a surprise set. Rather than finish performing the more recent “What I Be On,” the two cut to their former chart-topper, “Say Ahh.” While Fab spit his bars, the crowd nearly dubbed the rapper’s verse, adlibs and all, to the point his voice was over-powered by the packed venue.

After performing their “Oh My” remix, Trey and Fabolous called opener Big Sean back to the stage to spit his own rendition of the DJ Drama track. The trio then interacted with the crowd, having them competitively recite their trademark “Yuuup”, “Niiiiice”, “I Do It” and “Boi” adlibs.

Songz ran through his usual collection of hits, including "Neighbors Know My Name," "Invented Sex" and "Love Faces," among others, all of which had both sexes in the crowd singing along synonymously. In the midst of  “Sex Aint Better Than Love,” Songz made a heart shaped hand gesture at the concertgoers, which sent the ladies in the room into a frenzy. Trey Songz continued to lived up to his panty-droppa nickname, as female undergarments were spontaneously thrown to the stage throughout the night.

Big Sean lived up to his album’s Finally Famous title by putting on a show for the sold out crowd that G.O.O.D Music founder, Kanye West, would be proud of. The 2010 XXL Freshman began his thirty-minute set with breakthrough single, “My Last,” and followed with tracks like “I Do It,” “Memories,” “High” and “Don’t Tell Me You Love Me." The Detroit native more than held his own, impressively performing half of the tracks off his Finally Famous debut album without any of the featured artists.

After performing “Marvin Gaye and Chardonnay,” Big Sean’s set appeared to be finished as he thanked the crowd for coming out and walked off the stage. But as the lights went on and the audience began hitting the exit for the intermission, the instrumental for “A$$” dropped, and the crowd erupted, frantically heading back to their seats for his grand finale.

"A$$" proved to be a fan-favorite that night, as Trey also ordered Big Sean to perform “A$$” for a second time during his set before he closed out the show with “One Love” and “Top Of The World.” —Christian Bonoan @Chrisakachise