The Friends Theme is 'I'll Be There For You' Sung by The Rembrandts. Below are the lyrics to the song.

So no one told you life was gonna be this way. [clap,clap,clap,clap]
Your job's a joke, you're broke your love life's D.O.A.
It's like you're always stuck in second gear.
When it hasn't been your day. your week your month or even your year,
But,
I'll be there for you (When the rain starts to pour)
I'll be there for you (Like I've been there before)
I'll be there for you ('Cause you're there for me too)

You're still in bed at ten and work began at eight,
you burned your breakfast so far, things are going great.
Your mother warned you there'd be days like these.
But she didn't tell you when the world has brought down to your knees.
And,
I'll be there for you (When the rain starts to pour)
I'll be there for you (Like I've been there before)
I'll be there for you ('Cause you're there for me too)

No one could ever know me, no one could ever see me,
seems you're tyhe only one who knows,
what it's like to be me.
Someone to face the day with,
make it through all the rest with.
Someone I'll always laugh with.
Even at the worst I'm best with you.

It's like you're always stuck in second gear.
When it hasn't been your day, your week, your month or even your year.
But,
I'll be there for you (When the rain starts to pour)
I'll be there for you (Like I've been there before)
I'll be there for you ('Cause you're there for me too)

I'll be there for you
I'll be there for you
I'll be there for you ('Cause you're there for me too)