The Byzantine music is also of major significance to the history and development of European music, as liturgical chants became the foundation and stepping stone for music of the Renaissance (see: Renaissance Music). It is also certain that Byzantine music included an extensive tradition of instrumental court music and dance; any other picture would be both incongruous with the historically and archaeologically documented opulence of the Eastern Roman Empire. There survive a few but explicit accounts of secular music. A characteristic example is the accounts of pneumatic organs, whose construction was further advanced in the eastern empire prior to their development in the west following the Renaissance.