When did keyboard partitions start to use the G-clef for the upper staff ?

Question

When you look at very old sheetmusic (for harpsichord or organ), you see that the upper staff has a C-clef, first line. The lower one is the familiar bass F-clef, fourth line.Why and when did the habits change?Can you still find sheetmusic printed like this?Are there still people using the C-clef, first line position?

Answer 1

C- clefs were used for voices. Each voice type had their own C- clef telling them where is middle C on the staff. There is so soprano clef. mezzo-soprano clef, alto clef, tenor clef, and baritone clef. When the operatic world started to become popular, and the instrumental world started to increase, composers and performers were just tired of learning several clefs. So they invented the G- clef around the time after Bach's death. First for instruments only for kind of like a test run, and then composers used the G- clef and still uses it for vocal parts to this day. I personally think altos and tenors should still be in alto and tenor clefs.