MIT Mystery Hunt 2020/Coast to Coaster

Coast to Coaster is an audio puzzle from the round of the 2020 MIT Mystery Hunt.

Puzzle Elements
Flavortext - ''Welcome to the Coast to Coaster, the rollercoaster that hosts Penny Park’s very own radio station, WPUZ. Our show today is being picked up on both sides of the country, and if you’re listening to us from another city or town, enjoy the musical selections!''

Audio - The puzzle consists of 18 audio files...

Identification (Popular Music) - ...each one playing a song that has had one word bleeped out. Identify this word.

Hint in Flavortext - The flavortext makes reference to the call signs assigned to each radio station. In addition, it hints towards looking at the city where the radio station is licensed. The fact that the ride is a "coast-to-coaster" may also be a hint towards looking at terminal letters.

Knowledge Required (Miscellaneous) - Each bleeped-out word has a four-letter substring beginning with one of K or W; that substring is a call sign for a radio station. Take the cities associated with each.

Positional Extraction - A slight blend of Initial Letters and Final Letters, in that the initial letter extraction is used on western cities (with a K call sign) and the final letter extraction is used on eastern cities (with a W call sign).

Keep Going! - The resulting phrase is FM DECIMAL INTO TITLE.

Indexing - Only five of the eighteen stations used are FM stations; the rest are AM. For each FM station, index the digit in its frequency after the decimal point into the corresponding song's title; this produces the answer.