Taqsim
Appearance
Taqsim is the term of the first movement in Islamic music, which is a melodic improvisation style that could be metric or non-metric. The taqsim is usually performed by a solo voice or on a solo instrument yet sometimes the soloist can be backed by a percussionist or an instrumentalist playing a drone on the tonic of the maqam.
It is widely seen as an art of improvisation in a specific maqam, but usually modulation to other maqams are present in a taqsim.