I recognized the tune, but wasn't sure from what, but liked it. It was fun, catchy, upbeat... I looked them up on Wikipedia.
And if these guys get huge over here in the US, it could be the return of boy bands.
Which, it is about time - unless you include Nickelodeon and Disney Channel stars/bands the Jonas Brothers and Big Time Rush, there hasn't really been a string of successful boy bands since the late 90s when Hanson, The Backstreet Boys and Nsync blew up and others like 98 Degrees, LFO, Five, O-Town, Youngstown, etc came out of the woodwork too.
So far, The Wanted has been huge overseas in Europe, much like BSB and Nsync were before they hit it huge over here.
And "Glad You Came" has a similar catchy, upbeat sound and feel as "I Want You Back", "Tearin' Up My Heart", "Quit Playin' Games (With My Heart)", and "As Long As You Love Me".
Plus, there's 5 guys in the group, all aged 18-23.
"Glad You Came" has also already been performed on Glee this season too, by the Warblers at Regionals (which is where I originally heard it).
Keep your eyes and ears on these guys - I wouldn't be surprised if boy band mania is back in full swing by summer (15 years after the start of the last major boy band mania!).