Schwanengesang ("Swan song"), is the title of a collection of songs written by Franz Schubert at the end of his life and published posthumously. Ständchen "Serenade" is the most popular and famous. 
For Guitar and ensemble. Guitar early intermediate with some fingering suggestions.
With downloadable mp3's for audio help (one file with all, one file without the guitar for play-along or practice the guitar).
Pages: 7 pages (4 pages full score (Guitar, violin 1, violin 2, cello), 1 page Guitar standard notation only, 2 pages Guitar standard and tablature notation)). 4:10 min.

Romance from Eine kleine Nachtmusik by Wolfgang Amadeus Mozart (27 January 1756 5 December 1791). Eine kleine Nachtmusik (a little night music) K. 525, is a 1787 composition, with 5 movements.

Guitar solo. Early intermediate to intermediate. With standard notation and tablature (TAB).
With downloadable mp3 just for audio help.

Pages: Two (2) pages.

Canzonetta by Jan Ladislav Dussek (12 February 1760 – 20 March 1812).

For Classical Guitar solo (or acoustic Guitar with nylon strings, fingerstyle).

With tablature. With simple downloadable mp3 just for audio help.

Early intermediate to Intermediate Guitar. Pages: 2 page (+1 cover), 54 bars, 2' min.

Romance by Francesco Molino (4 June 1768 1847).

Guitar Solo. Easy to early intermediate.

With downloadable mp3 just for audio help.

With standard notation and Tablature (TAB).

Pages : Two (2) pages.

Romantic Melodie by Marco Aurelio Zani de Ferranti (1801-1878).
Classical guitar solo sheet music with tablature with some fingering suggestions.
Early intermediate.
Pages: Two (2) pages music score + 1 page cover.