German.

Finally a modern collection of folk tunes for violoncello! The songs come from England, Ireland, Scotland, Russia, Italy, France, Spain and the USA. Popular melodies such as 'Auld lang syne' and 'Oh happy day' are set in easy arrangements and can be played on various occasions, be it at home, at school, or in an ensemble. The arrangements can also be played with an additional second part.

As a student 40 years ago I wrote a thesis about all existing cello methods. Then I started writing my own method by putting all positive aspects of all methods together.
The music selection is the best I could find for each level progressing in well prepared steps, enjoyable to play.
Exercises are compact and to the point, only used when needed.
Volume 3 contains No 64-100 on 60 pages - Learning to shift from Half position over first, second, third to 4th position. All pieces are written in form of a cello duo to be able to play with a friend or teacher together - includes traditional songs, fiddle tunes and compositions by Offenbach, Bach, Carcassi, Tchaikovsky, Moore, , Boccerini, Boris Fomin and Kummer.
To each number are video cello lessons published on Patreon. The links click through when viewed on phone, tablet or computer.
There are also Youtube recordings of all pieces as Cello Duos with fingerings and bowings as in the Cello Method, see https://www.youtube.com/playlist?list=PLa4x_CVYDVRXAnJJ_6HeRujngwTZ8cMEd