"Joy to the World" is a popular Christmas carol with lyrics by Isaac Watts and music by G.F.Handel. As of the late 20th century, Joy to the World was the most published Christmas hymn in North America.
For Flute and guitar duet.
Easy.
With downloadable mp3's for audio help (one with both the Flute and guitar and one with guitar only for practicing the flute).
With guitar tablature. With melody line. With lyrics.
Pages: three pages (score and Flute part)

How Great Thou Art is a Christian hymn based on a Swedish traditional melody and a poem written by Carl Boberg (18591940)  Sweden, in 1885. How Great Thou Art was ranked second (after Amazing Grace) on a list of the favourite hymns of all time in a survey by Christianity Today magazine in 2001.

For Flute and Guitar duet (Guitar in double D tuning (D,A,D,G,B,D)).

With standard notation and tablature.
Easy to early intermediate.

Pages: SIx (6) pages. (3 pages Melody/Flute and Guitar with tab, 1 page Melody/Flute part, 2 pages Guitar and tab part).

My One and Only Love is a popular song (1953) with music written by Guy Wood and lyrics by Robert Mellin. Typically performed as a ballad, it has an aria-like melody that is a challenge to many vocalists.
The song has many cover versions by artists as Frank Sinatra, Charlie Ventura, Sarah Vaughan, Dean Martin, Ella Fitzgerald, Doris, Day, Andy Williams, Louis Armstrong, Rod Stewart, Bob Dylan and many more.

Flute and Guitar. Early intermediate.

With standard notation and Tablature (TAB). With chord. With lyrics and melody line.

Pages : Seven (7) pages. (4 pages full score, 1 page flute part, 2 pages guitar with tab).