Full-service stations will often mix the oldies, classic rock, classic hits, and adult standards music, occasionally with music found in formats such as beautiful music, adult contemporary, or classic country. On weekends, specialty or niche programs focusing on formats such as Celtic music, polka and Italian music (depending on the ethnicity of the area) are common. In addition to music, a limited amount of local talk programming is heard on most full-service stations. Full service tends to be heard primarily on rural stations. These formats all have small but very loyal audiences in the largest markets. Most follow formats similar to the above (Top 40s, Freeform, AOR and Oldies), except with a different playlist. Public service stations following these formats tend to be "freeform" stations. Regional Mexican is a Latin music radio format, typically including Banda, Conjunto, Corridos, Duranguense, Grupero, Huapango, Mariachi, New Mexico music, Norteña, Ranchera, and Tejano music. It is the most popular radio format targeting Hispanic Americans in the United States.[2]  The large number of immigrants from Northern Mexico can lead to an emphasis upon Norteña on Regional Mexican radio stations,[1] though markets with larger Hispanic audiences can have multiple Regional Mexican stations, with variations in which region from which the music is taken and where it is popular. Easy listening and adult contemporary are related formats that play largely down-tempo pop music of various styles. The difference is mostly in the era and styles covered -- Easy Listening is mostly older music done in the style of standards from the early 20th century (typical artists include Johnny Mathis and Frank Sinatra) combined with Big Band music and more modern performers in the same style such as Céline Dion and Josh Groban, while Adult Contemporary focuses more on newer pop music from the 1970s on. An ancestor to the easy listening format is Beautiful Music, a now-rare format (though XM features one channel of it, called Sunny) focusing mostly on smooth jazz or classical arrangements of pop music and original compositions in a similar vein. Perhaps the best-known Adult Contemporary station currently in operation is WLTW in New York City, better known as 106.7 Lite FM. Jazz stations generally play either traditional jazz forms or smooth jazz. The jazz station, more than any other except the college station, is stereotyped as having a small listenership and a somewhat overly highbrow on-air personality, and many are college-run stations.