Instrumental Duet Flute,Guitar,Instrumental Duet - Level 2 - Digital Download SKU: A0.556686 Composed by Fred E. Ahlert. Arranged by PianoSheetNow. 20th Century,Contemporary,Jazz,Pop. Score and parts. 4 pages. PianoSheetNow #4892557. Published by PianoSheetNow (A0.556686). I Don't Know Why (I Just Do) with music by Fred E. Ahlert andlyrics by Roy Turk. The song was published in 1931 and has many recordings by artists as Russ Columbo, Wayne King, Frank SInatra, Linda Scott, Eden Kane, Jerry Lee Lewis and Dean Martin.For Flute and Guitar duet or Flute, Guitar and voice.With melody line and lyrics. With standard notation and tablature.