Bach has received commissions from the Orpheus Trio, the Chicago Brass Quintet, Harvey Phillips, the Orchestra of Illinois, the International Trumpet Guild, the Greenwich Philharmonia, the Indianapolis Symphony, the Sacramento Symphony, the Biddle Trust, the Pew Memorial Trust, Chamber Music America, and many others. Performance highlights have included his trio Eisteddfod at the 1979 Aldeburgh Festival in England, his opera The Student from Salamanca produced by Beverly Sills for the New York City Opera Company and his 1991 Anachronisms, written for the Vermeer String Quartet and commissioned and broadcast live to 261 FM stations nationwide in its premiere by WFMT, Chicago's Fine Arts radio station.

Within the last few years his concertos for horn, trumpet, harp, and euphonium as well as other works have been performed at international conventions of the horn, trumpet, harp, tuba, trombone, flute, and double-reed associations; in the summer of 1990 selections of his chamber music appeared on programs of virtually every summer music festival in the U.S. In celebration of Dr. Bach's fiftieth year his music was performed in full concerts at the University of Southern Maine and Illinois Wesleyan University. In 1995 his Concerto for Euphonium and Orchestra was chosen for the final round of the international euphonium competition held in Japan every four years. In November of 1995 his Concerto for Steelpan and Orchestra, with Liam Teague as soloist, was premiered at Orchestra Hall in Chicago to enthusiastic reviews, with many additional performances taking place over the past six years. Recently -completed works receiving their premieres early in 1996 include Foliations, written specifically for a recording by the Stockholm Chamber Brass, and The Last Flower, for four musicians/narrators  (harp, cello, clarinet, percussion) from the Indianapolis Symphony. In 1997, Variations on a Theme of Brahms was premiered by the Elmhurst Symphony. Premieres in 1998 include Concertino for Bassoon and Strings, performed by the North Carolina Symphony with Victor Benedict, soloist, and Pilgrimage, a fifteen-minute work for trumpet and piano, performed by Ramon Parcells, soloist, first trumpeter with the Detroit Symphony, who commissioned the work and introduced it at the Interlochen School for the Arts. 1999 saw the completion of two choral pieces, Dear God, for children's chorus, piano four-hands and percussion; and In the Hands of the Tongue, a set of five choral songs for the Cantori singers at Hobart and William Smith Colleges in upstate New York. NIU Music, for French horn and piano, also dates from this period. Works produced in 2000 include The Duel (better known as the Gingham Dog and the Calico Cat) for the Northern Illinois Children's Chorus and piano, and Songs of the Streetwise, a set of seven songs for mixed chorus and steel band based on collected poems of Chicago's homeless people and written for the South Bend Chamber Choir directed by Dr. Nancy Menk. His most recent large-scale work was his Concerto for Tuba and Orchestra, premiered by Jay Hunsberger and the Florida West Coast Symphony's Chamber Orchestra in March, 2003.