Nas : Was not.

Nas : Has not.

Example:
How do you feel about Nas holding different things in the community?

Taxonomy
song, Jay-Z, Reid, MTV News, mtv, hip-hop, allmusic, rappers, Illmatic, video, The Firm, Hip Hop Is Dead, Bill O'Reilly, O'Reilly, Jones, It Was Written, Shaheem Reid, concert.

Defination from the web:
Nas was involved in a widely publicized feud with rapper Jay-Z; both rappers verbally ... While his family lived in Crown Heights, Brooklyn, Nas would play the trumpet on his home stoop at age four. ... In 1994, Nas's debut album, Illmatic, was finally released. ...