The earliest solo keyboard music to date is Pierre Attaingnant’s Quatorze Galliardes, neuf pavennes (1531) and indeed most of the music which is categorised as being for “keyboard”  is, by default, solo.

Continuo

There is a special page for continuo players which list pieces which include you in a variety of contexts such as:

• Solo + continuo
• Soprano instrument + continuo (Soprano instrument + continuo ↣)
• Two sopranos + continuo (SS + continuo ↣)
• Soprano and tenor + continuo (ST + continuo ↣)
• Soprano and bass + continuo (SB + continuo ↣)
• Three altos + continuo (AAA + continuo ↣)
• (The Continuo Page ↣)