Alan Jackson, Reba McEntire and Gary Allan have joined the 2009 lineup for RodeoHouston's annual concert series. Jackson, who has performed at the event every year since 1992, will play on March 4. McEntire is set for March 11. Allan returns on March 18 for his first appearance there since 1997. Previously announced performers include the Jonas Brothers, Brad Paisley, Rascal Flatts and Taylor Swift. RodeoHouston will be held March 3-22. The full lineup will be revealed Jan. 12.