Plain White T's

Plain White T's is an American rock band from Lombard, Illinois. Formed in 1997 by high school friends Tom Higgenson and Ken Fletcher, the group had a mostly underground following in Chicago basements, clubs, and bars in its early years, and underwent numerous personnel changes.
The band is best known for the number-one hit song "Hey There Delilah", which achieved platinum status in 2007 and earned two Grammy nominations, as well as "1, 2, 3, 4", which turned platinum in 2009.