Escrita por Tom Petty, foi gravada no final de 1977, no Shelter Studios, em Hollywood, California. Foi lançada em 2 de maio de 1978, no disco You're gonna get it, o segundo da banda. Saiu também em compacto em junho de 1978, com No second thoughts como Lado B. Foi produzida por Denny Cordell, Noah Shark e Tom Petty. Chegou ao número 41 do Billboard Hot 100 e número 46 no Canadá. Foi regravada por Stevie Nicks, entre outros artistas.
A letra:
Well,
the talk on the street
Says you might go solo
Good friend of
mine
Saw you leavin' by your back door
I need to know (I need to know)
I
need to know (I need to know)
If you think you're gonna leave
Then
you better say so
I need to know (I need to know)
I need to
know (I need to know)
Because I don't know how long I can hold
on
If you're makin' me wait, if you're leadin' me on
I need to
know (I need to know)
I need to know (I need to know)
Who would've thought that
You'd fall
for his line?
All of a sudden
It's me on the outside
I need to know (I need to know)
I
need to know (I need to know)
If you think you're gonna leave
Then
you better say so
I need to know (I need to know)
I need to
know (I need to know)
Because I don't know how long I can hold
on
If you're makin' me wait, if you're leadin' me on
I need to
know (I need to know)
I need to know (I need to know)
Wow!
Baby, I need to know (I need to know)
I
need to know (I need to know)
If you think you're gonna leave
Then
you better say so
I need to know (I need to know)
I need to
know (I need to know)
Because I don't know how long I can hold
on
If you're makin' me wait, if you're leadin' me on
I need to
know (I need to know)
I need to know (I need to know)
Baby, I
need to know
A versão de Tom Petty and The Heartbreakers:
A versão de Starcrawler:
A versão de Tom Petty e os Heartbreakers com Stevie Nicks: