María José "Mery" Bas Arguijo (Spanish pronunciation: [maˈɾi.a xoˈse ˈmeɾi ˈβas aɾˈɣixo]; born 29 December 1967) is a Spanish singer.

Since 2018, she has been one half of the electropop duo Nebulossa, together with her husband Mark Dasousa.

Bas was born in Marseille on 29 December 1967, but moved to Alicante as a child.

[2] In 2022, along with Ophelia Alibrando,[3] they participated in Una voce per San Marino, San Marino's preselection contest for the Eurovision Song Contest 2023, but did not progress past the audition stage.

Dasousa and Bas have been married for over 20 years and they have two children together; a daughter named Maria born in 2000 and a son named Neo born in 2014.