Strings of thr Arpeggioe

At the time, but generally Gut strings, steel strings and the song was adapted.
I tune on the guitar's six strings as (mi, LA, LE, So, Si, Mi) and four times three is considered easy to play to capture the open string.
The songs, however, ethnic violin (cello) to complete the five-degree (DE, Alonso, Rae, LA) also thought his solo tune easily.
By the way, if the string is increased, the tuning of the cello (DE, Alonso, Rae, LA) (Mi, or the Soviet Union, and it's not even thought of adding a string such as a resonant system? .
The Viola da Gamba奏法familiar with seven strings, strings, and I urge professors and how to tune.