[Verse 1]
Someone I used to know called me today
And said, "Hello"
And when I heard her voice something inside me
Whispered, "Oh, no"

[Chorus]
There was a time when I would run
Each time she called me
And whispered, "Baby"
But I have changed the lock on my heart now
You have the only key

[Verse 2]
Someone I used to know (Someone I used to know)
Less than a week ago (Less than a week ago)
Can't be compared to you
She's just someone I used to know

[Instrumental Break]

[Chorus]
There was a time when I would run
Each time she called me
And whispered, "Baby"
But I have changed the lock on my heart now
You have the only key
[Verse 2]
Someone I used to know (Someone I used to know)
Less than a week ago (Less than a week ago)
Can't be compared to you
She's just someone I used to know (Someone I used to know)

[Outro]
Someone I used to know (Someone I used to know)
Someone I used to know (Someone I used to know)
Someone I used to know (Someone I used to know)
Someone I used to know (Someone I used to know)
Someone I used to know (Someone I used to know)
Someone I used to know (Someone I used to know)
Someone I used to know (Someone I used to know)
Someone I used to know (Someone I used to know)