This is the Kenny Rogers' version of Unforgettable which was originaly sung by Nat King
Although I like both versions I found Kenny Rogers' version more suitable for guitar.
intro in this version is played on keyboard. I may have left out a few chords but it 
doesn't afect that much.

Fmaj7 (1x3210@1)                        E7Unforgettable, (020130@1)that's what you are
Gm7                           D9sus4
Unforgettable, though near or far
Cm7            Ebm7 (x3131x@4)                 Bbmaj7Like (x13231@1)a song of love that clings to me
         Ab7 (xx1112@1)         G7How (320001@1)the thought of you does things to me
C9 (x3233x@1)             Am7 (x02010@1)        C9Never (x3233x@1)before has someone been more

Fmaj7 (1x3210@1)                 E7Unforgettable, (020130@1)in every way
Gm7                                 D9sus4
And forever more, that's how you'll stay
Cm7                  Ebm7 (x3131x@4)          Bbmaj7That's (x13231@1)why, darling, it's incredible
      Ab7 (xx1112@1)     G7That (320001@1)someone so unforgettable
C9 (x3233x@1)             F (133211@1)           Bb--- (x1333x@1)C#7 (x43121@1)Thinks that I am unforgettable too


---instrumental interlude---(one note higher)
Fmaj7#   F7  G#m7   D#9sus4   C# m7  Em7
7  A7 (x02020@1) G#7 (xx1114@1)

C#9 (x4344x@1)           Am#7        C#9-- (x4344x@1)D7Never (xx0212@1)before has someone been more 
Gmaj7 (xx5432@1)                 F#7 (244322@1)Unforgettable, in every way
Am7 (x02010@1)                               F9sus4
And forever more, that's how you'll stay
Dm7                  Fm7 (131141@1)           Cmaj7That's (x32000@1)why, darling, it's incredible
      Bb7 (x13131@1)     A7That (x02020@1)someone so unforgettable
Dm7             Fm7 (131141@1) G7 (320001@1)     C-- Cmaj7Thinks (x32000@1)that I am unforgettable too