What has always been known in the U.S. as the Hot 100 had existed for nearly fifteen years as numerous charts, tracking and ranking the most popular singles of the day in several areas. During the 1940s and 1950s, popular singles were ranked on three significant charts:
• Best Sellers in Stores
• Most Played by Jockeys
• Most Played in Jukeboxes

On June 17, 1957, Billboard discontinued the Most Played in Jukeboxes chart, as the popularity of jukeboxes waned and radio stations incorporated more and more rock-oriented music into their playlists. The week ending July 28, 1958 was the final publication of the Most Played By Jockeys.
On August 4, 1958, Billboard premiered one main all-genre singles chart: the Hot 100. The Hot 100 quickly became the industry standard and Billboard discontinued the Best Sellers In Stores chart on October 13, 1958.
The Billboard Hot 100 is still the standard by which a song's popularity is measured in the United States. The Hot 100 is ranked by radio airplay audience impressions as measured by Nielsen, sales data compiled by Nielsen (both at retail and digitally) and streaming activity provided by online music sources.

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You’ll hear:
1) I'm A Believer (Reached #1 on Dec 31, 1966 Lasted for 7 wks) by The Monkees
2) Kind Of A Drag (Reached #1 on Feb 18, 1967 Lasted for 2 wks) by The Buckinghams
3) Ruby Tuesday (Reached #1 on Mar 4, 1967 Lasted for 1 wk) by The Rolling Stones
4) Penny Lane (Reached #1 on Mar 18, 1967 Lasted for 1 wk) by The Beatles
5) Something Stupid (Reached #1 on Apr 15, 1967 Lasted for 4 wks) by Frank Sinatra & Nancy Sinatra
6) Respect (Reached #1 on Jun 3, 1967 Lasted for 2 wks) by Aretha Franklin
7) Windy (Reached #1 on Jul 1, 1967 Lasted for 4 wks) by The Association
8) Light My Fire (Reached #1 on Jul 29, 1967 Lasted for 3 wks) by The Doors
9) Ode to Billie Joe (Reached #1 on Aug 26, 1967 Lasted for 4 wks) by Bobbie Gentry
10) The Letter (Reached #1 on Sep 23, 1967 Lasted for 4 wks) by The Box Tops
11) To Sir With Love (Reached #1 on Oct 21, 1967 Lasted for 5 wks) by Lulu
12) Judy In Disguise (With Glasses) (Reached #1 on Jan 20, 1968 Lasted for 2 wks) by John Fred & His Playboy Band
13) (Sittin' On) The Dock Of The Bay (Reached #1 on Mar 16, 1968 Lasted for 4 wks) by Otis Redding
14) Mrs. Robinson (Reached #1 on Jun 1, 1968 Lasted for 3 wks) by Simon & Garfunkel
15) People Got To Be Free (Reached #1 on Aug 17, 1968 Lasted for 5 wks) by The Rascals
16) Harper Valley P.T.A. (Reached #1 on Sep 21, 1968 Lasted for 1wk) by Jeannie C. Riley
17) Hey Jude (Reached #1 on Sep 28, 1968 Lasted for 9 wks) by The Beatles
18) Love Child (Reached #1 on Nov 30, 1968 Lasted for 2 wks) by Diana Ross & The Supremes
19) I Heard It Through The Grapevine (Reached #1 on Dec 14, 1968 Lasted for 7 wks) by Marvin Gaye