obligatoriness

noun 0.661

obligation

noun 0.619

obliging

noun 0.602

mandatory

noun 0.588

wajib

noun 0.587

compulsory

noun 0.581

ostinato

noun 0.569

unavoidable

noun 0.546

cantabile

noun 0.540

indispensable

noun 0.536

accompagnato

noun 0.523

requisite

noun 0.522

appoggiatura

noun 0.516

sostenuto

noun 0.514

legato

noun 0.512

basso continuo

noun 0.512

must-have

noun 0.508

ossia

noun 0.506

sine qua non

noun 0.506

oblation

noun 0.503