Have I Told You Lately That I Love You is an old standard, my 95 year old aunt's favourite song, but Rod Stewart also sang (Wrote?) an entirely different song with the same title.

Loudon Wainwright and Donovan both wrote songs called COLOURS.
Donovan:"Blue is the colour of the sky,
         In the mornin', when I rise.
         That's the time, (That's the time)
         That's the time, (That's the time)
         I love the best."

Loudon:"The shit on the streets of our town,
       Comes in various colours of brown..."