More stars for the summit: World-famous cellist Yo-Yo Ma, country music star Trisha Yearwood and singer-songwriter Sara Bareilles will be performing with students at the Pittsburgh Creative and Performing Arts School (CAPA) on Friday when first lady Michelle Obama takes G-20 spouses for a tour and concert at the school.

Semonti Stephens, deputy press secretary for Mrs. Obama, said the visiting artists would have some involvement with students, although the extent would be worked out during rehearsal. Earlier in the process, students were auditioned by a team headed by composer-conductor Marvin Hamlisch and Carnegie Mellon University professor of drama and music Greg Lehane. They also worked with the students during every stage of the production, from set design to lighting and performing. Mr. Hamlisch will not be able to attend on Friday due to a scheduling conflict, Ms. Stephens said.

The tour of the school will include drop-ins to several classes: a student orchestra performance with 40 students in grades 6-8; a troupe of 80 high schoolers practicing for their performance of the "Les Miserables"; a choir of 40 students in grades 7-12 singing songs about hope; and 35 students from various grades performing modern dance.

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Mrs. Obama will then host a show in CAPA's auditorium featuring students and visiting artists.

In a statement explaining his interest in the CAPA show, Mr. Hamlisch said: "There is a global nature to music. It has the potential to bring all people together. It truly is the international language, which is why I wanted to be a part of the first lady's commitment to arts education at this year's Pittsburgh summit. I wish these talented students all the best as they continue to make a difference."

The students will perform a dance entitled "Eternal Embrace" set to music by Karan Casey and choreographed by CAPA teacher Kevin Maloney. Rocco Landesman, chairman of the National Endowment for the Arts, will be emceeing the performance.