Who sang - Oh wont you stay just a little bit longer?

"Stay" (Just a little bit longer) is originally by Maurice Williams & the Zodiacs. There have been several covers and remakes of it including;

1963 The Hollies

2964 Frankie Valli & the Four Seasons.

1964 Frankie Valli & the Four Seasons

1977 Jackson Browne (live)

There is also a song called "A Little Bit Longer" by the Jonas Brothers, but it is not a cover of the Maurice William's song.