Polyphony and monophony in instruments harpejji and the Chapman stick). Multiphonics can be used with many regular wind instruments to produce two or more notes at once, although this is considered an extended technique. Explicitly polyphonic wind instruments are relatively rare, but do exist. The standard harmonica can easily produce several notes at once. Multichambered ocarinas are manufactured in a number of varieties, including double, triple, and quadruple ocarinas, which use multiple chambers to extend the ocarina's otherwise limited range, but also enable the musician to play more than one note simultaneously. Harmonic ocarinas are specifically designed for polyphony, and in these instruments the range
Owned-and-operated television stations in the United States and CBS' KMOX-TV (channel 4, now KMOV) in St. Louis. As a result of a revision to the FCC's media ownership rules in 1999, a company can now own any number of television stations with a combined market reach of less than 39% of the country, but cannot own two of the four highest-rated stations in any market. Still, O&Os in the United States are primarily found in large markets such as New York City, Los Angeles and Chicago, among others. Despite that, network-owned stations can still be found in smaller markets (for example, KFSN-TV (channel 30) in Fresno, California