Silent Night (Stille Nacht) is a popular Christmas carol, composed in 1818 by Franz Xaver Gruber. It was declared an intangible cultural heritage by UNESCO in 2011. The song has been recorded by a large number of singers (Bing Crosby, John Denver, Neil Diamond) from every music genre.
For Violin and guitar (fingerstyle) duet.
Violin Easy. Guitar Easy to Early Intermediate.
With downloadable mp3's for audio help (one with both the Violin and guitar and one with guitar only).
With guitar tablature. With melody line. With lyrics.
Pages: four pages (3 pages score, 1 page Violin part).

Serenata Rimpianto Op.6 No.1, by Enrico Toselli, Count of Montignoso (March 13, 1883 January 15, 1926).
For Violin and Piano duet. With downloadable mp3 for audio help.
Violin Early Intermediate, piano Intermediate

Six pages (3 pages both Violin and piano, 1 page Violin part, 2 pages Piano part), 3:20' min.

Romanesca is a 16th century tune for Violin and Piano duet.

Violin Early Intermediate, Piano Intermediate. With downloadable mp3 for audio help.

Eleven pages (5 pages both Violin and piano, 2 page Violin part, 4 pages Piano part), 6' min.

Total: 11 pages.

The pleasure of love, is a classical French love song written in 1784 by Jean-Paul-Egide Martini (17411816).
Here is an arrangement for Violin and Guitar duet.
With downloadable mp3 for audio-help, 2:10 min. With guitar standard notation and tablature.
Six pages (3 pages both Violin and guitar, 1 page Viloin part, 2 pages guitar part with tablature).
Violin early intermediate to advanced, Guitar easy.

O mio babbino caro ("Oh my dear daddy") is a soprano aria from the opera Gianni Schicchi by Giacomo Puccini. The aria was first performed on 14 December 1918 at the Metropolitan Opera in New York.
Here is an arrangement for Violin and guitar duet. Early Intermediate.
With  guitar tablature. With downloadable mp3 just for audio help. With lyrics.
Pages:  Four pages score and parts (two pages both violin and guitar, 1 page violin part, one page Guitar part), 1:18 min.