Layālī (ليالي) is a style of unmetered modal improvisation, based on a maqam, performed by a singing voice in Arabic music.
It is similar to the taqsim, which is performed by a solo instrument.
The layali generally serves as an introduction to a mawwāl.
In the layali, the singer most often improvises using the common Arabic phrase "Yā ‘ayn yā layl" (يا عين يا ليل), which means "O eye, O night."
The term layālī is the plural form of the word layl (ليل, meaning "night").