Personnel changes are thick on the musical ground this week: The St. Louis Symphony Orchestra has announced that the concerts of January 27 through 29 will have a new conductor and new soloist. The repertoire, however, remains the same.

The program - Jean Sibelius's En saga, Franz Liszt's Piano Concerto No. 1, and Piotr Tchaikovsky's Symphony No. 4 - was to have been led by conductor Vassily Sinaisky, with pianist Louis Lortie.

A hiking injury forced Lortie to cancel all his engagements for the next several months; he's expected to make a complete recovery. Sinaisky is suffering from unspecified scheduling conflicts.

Guest conductor Christopher Warren-Green will replace Sinaisky on the Powell Symphony Hall podium; he's currently the music director of the Charlotte Symphony Orchestra, guests widely, and got some extra-classical exposure last year when he conducted the music for the royal wedding.

Brazilian-born pianist Arnaldo Cohen, who made his SLSO debut last March, will take Lortie's spot.

The program will be performed at 10:30 a.m. on Friday, January 27, at 8 p.m. Saturday (a performance which will also be broadcast and streamed live on KMWU-90.7 FM), and at 3 p.m. Sunday. Tickets are $25 to $110; for more information, call the box office at 314-534-1700, or visit www.stlsymphony.org.