The Young Israel Philharmonic Orchestra, which brings together the country's most outstanding young musicians twice a year, will perform two concerts this month. Ze'ev Dorman will conduct the players on July 23 and July 24 in Beethoven's Symphony No. 6 (Pastoral), Ravel's Bolero and Prokofiev's Romeo and Juliet. The orchestra forms for two weeks in which the musicians live and work together under the auspices of the Jerusalem Music Center. Professional musicians join in training the novices.