Austin had an interesting Beautiful Music dynamic at the end of the 1960s and beginning of the 1970s.
The original KHFI 98.3 had been running a Beautiful Music format since 1964 (after new owners dumped Classical.) The music emphasized lush, strings-based arrangements that were typical of the genre at the time.
In 1969 KHFI got a rival in the form of KASE 100.7. KASE targeted the same audience, but its music was wind instrument based. They used the liner “The station with that big band sound” although the music only vaguely resembled the big bands of the 30s and 40s. To my ears KHFI and KASE were pretty much the same type of music, just with different instrumentation.
A few years later, KHFI had gone in a few different directions and KASE morphed into string based music.
Postscript: KHFI had perhaps the most stark “dual format“ from 1971 to 1972. At the beginning of 1971 it kept the Beautiful Music from 6am to 9pm but ran a freeform Progressive Rock format from 9pm to 6am. A few months later the Rock format was full time. However in June 1971 KHFI got a Progressive Rock competitor in KRMH, which split the audience. By the summer of 1972 KHFI was back to fulltime Beautiful Music. But KASE had grabbed the audience (with a better signal) and the Beautiful Music format was gone for good on KHFI by the fall of 1973.
Post-postscript: KASE kept the Beautiful Music format until 1981 when it flipped to Country, which it maintains to this day. Beautiful Music was picked up by KPEZ 102.3 (ex-KMXX) but was gone by 1986, the end of the format in Austin, other than fringe coverage from KNCT in Killeen.
Post-post-postscript: Austin Classical fans displaced by the KHFI flip in 1964 got Classical back with the launch of KMFA in January 1967. The station is still going with the format 56 years later.