The Notorious B I G feat. Frank Sinatra Juicy, New York (2006)

These two DJs were behind this mashup album called Blue Eyes Meets Bed Stuy, which used Notorious B.I.G.'s vocals over instrumentals from songs sung by Ol' Blue eye himself, Frank Sinatra. If you're sick and tired of listening to some BIG feat. Eminem feat. 50 Cent feat Shakira bullshit grab hold of this, a nice way both to refresh your Biggie collection and enter into the great Sinatra’s music.

The Notorious B.I.G - Who Shot Ya? (1995)

The B side to his 1995 single, Big Poppa. The track was later released on the posthumous Born Again, the remastered edition of Ready to Die, and The Greatest Hits.

Originally the song was recorded for the Mary J. Blige album My Life and meant for what eventually became the K. Murray Interlude (as evidenced on the track by use of the same instrumental) however Biggie's version was deemed too violent for an R&B album and Keith Murray was asked to record his version instead. The song samples David Porter's I'm Afraid The Masquerade Is Over.

And an prophetic title to boot. Yes, I know the song is meant to be a Tupac diss, but you can't help but wonder what was going on.

The Notorious B.I.G. - Hypnotize (1997

The first single from his posthumous album Life After Death in April 1997.

Faith Evans - You Used To Love Me (1995)

Faith Evans' first single from her debut album Faith. Released as a single in 1995, it peaked at number 24 on the Billboard Hot 100 chart.
Produced by Sean "Diddy" Combs and Chucky Thompson, the song was featured in The Notorious B.I.G biopic, Notorious, when Faith Evans' character sees B.I.G. with another woman in a hotel. In addition, it was also featured in the 2008 film, The Wackness.