Timothy B. Schmit came up with the song title and composed the nucleus of "I Can't Tell You Why", which he then presented to Glenn Frey and Don Henley and they completed the song together. Henley described the finished song as "straight Al Green", and that Frey, an R&B fan as he came from Detroit and grew up with the music, was responsible for the R&B feel of the song. Frey said to Schmit: "You could sing like Smokey Robinson. Let’s not do a Richie Furay, Poco-sounding song. Let’s do an R&B song."
Recorded in March 1978, it was the first song finished for the album and the first Eagles song to feature Schmit on lead vocals. Released as a single in February 1980, it became a Billboard top 10 hit in April of that year, reaching number 8 on the Billboard Hot 100 and number 3 on the Adult Contemporary chart. It was the group's last top ten hit on the Billboard Hot 100.
Lyrics
Look at us baby, up all night
Tearing our love apart
Aren't we the same two people
Who lived through years in the dark?
Every time I try to walk away
Something makes me turn around and stay
And I can't tell you why
When we get crazy
It just ain't right
(try to keep your head, little girl)
Girl, I get lonely, too
You don't have to worry
Just hold on tight
(don't get caught in your little world)
'Cause I love you
Nothing's wrong as far as I can see
We make it harder than it has to be
And I can't tell you why
No, baby, I can't tell you why
I can't tell you why
Every time I try to walk away
Something makes me turn around and stay
And I can't tell you why
No, no, baby, I can't tell you why
I can't tell you why
I can't tell you why, no