Kumvetsera mosavuta (nthawi zina kumadziwika ngati nyimbo zosangalatsa) ndi mtundu wotchuka wa nyimbo ndi wailesi yomwe imakonda kwambiri pa 1950s ku 1970s. Zimakhudzana ndi nyimbo zapakati pa msewu (MOR) ndipo zimaphatikizapo zolemba zoyendetsera nyimbo, nyimbo zomveka komanso nyimbo zomwe anthu ambiri samakonda. Zinasiyanitsidwa kuchokera kumasewero okongola a nyimbo ndi machitidwe ake osiyanasiyana, kuphatikizapo kuchuluka kwa mawu, makonzedwe ndi ma tempos kuti zigwirizane ndi magawo osiyanasiyana tsiku tsiku lofalitsa.

No mankhwala anapezeka zofanana kusankha.