The tunes in this video are: An der Saale hellem Strande Bald gras' ich am Neckar Drunten im Unterland Santa Lucia Guter Mond, Du gehst so stille
The ebook (below) contains 14 tunes, and is in German, but don't worry. The first tune, on page 6, is Brahm's Lullaby, and is fun to dive right into. Welti uses upstrums in his arrangements, so watch out for them in the tab!