There's still no solidified release dates for upcoming Interscope albums from Eminem and 50 Cent, but new music from both acts has emerged in the past 24 hours.

Eminem's "Crack a Bottle," which features 50 as well as Dr. Dre, leaked online today (Jan. 6); an earlier version without the guest appearances had leaked in November, much to the dismay of Eminem.

"It wasn't close to finished, and it even has me doing guide vocals for Dre as a suggestion of how he could lay his verses down," he told Billboard in an exclusive interview. Eminem's new album, "Relapse," is expected this spring.

Meanwhile, a new 50 Cent song, "I Get It In," debuted last night on New York radio station Hot 97. Its parent album, "Before I Self Destruct," was originally due Dec. 9 but was delayed while the rapper continued recording. An Interscope spokesperson was unable to confirm a rumored Feb. 3 release date.

An earlier single "Get Up," peaked last year at No. 23 on Billboard's Hot R&B/Hip-Hop Songs chart.