'Crazy on You' was written in 1975 by Ann and Nancy Wilson. Although it is a hard rock song, and typical of Heart's sound, the introduction is on acoustic guitar, played by Nancy Wilson. Both electric and acoustic guitars feature as the song continues. Ann Wilson's strong voice tells of longing to escape from everyday problems in a night of passion.

We may still have time, we might still get by
Every time I think about it, I wanna cry
With bombs and the devil, and the kids keep comin'
No way to breathe easy, no time to be young

But I tell myself that I'm doin' all right
There's nothin' left to do at night
But to go crazy on you
Crazy on you
Let me go crazy, crazy on you, oh

My love is the evening breeze touching your skin
The gentle, sweet singing of leaves in the wind
The whisper that calls after you in the night
And kisses your ear in the early light
And you don't need to wonder, you're doing fine
My love, the pleasure's mine

Let me go crazy on ya
Crazy on you
Let me go crazy, crazy on you, ohhh

Wild man's world is crying in pain
What you gonna do when everybody's insane
So afraid of one who's so afraid of you
What you gonna do...ohhh...

Ooooo...Crazy on ya
Crazy on you
Let me go crazy, crazy on you

I was a willow last night in my dream
I bent down over a clear running stream
I sang you the song that I heard up above
And you kept me alive with your sweet flowing love

Crazy
Yeah, crazy on ya
Let me go crazy, crazy on you, oh
Crazy on ya
Crazy on you
Let me go crazy, crazy on you, yeah

Crazy on ya
Crazy on you
Let me go crazy, crazy on you, ohhh...

'Crazy on You' was recorded in 1975 and released as a single in 1976, with the B side 'Dreamboat Annie'. It was Heart's first single to enter the charts, and reached #35 in the US Billboard Hot 100. Two years later it was re-released, this time reaching #62 and #2 in the Netherlands' Top 40.

'Crazy on You' has featured in the following movies:

- The Virgin Suicides (1999)- it is played while Lux and Trip have their first kiss
- American Pop (1981)
- Harold and Kumar go to White Castle (2004)
- Juno (2007)

'Crazy on You' also features on Guitar Hero II.