WBGB (103.3 MHz) – branded as Big 103 – is a commercial adult hits FM radio station licensed to Boston, Massachusetts.

Beginning in 1965, WEEI-FM began carrying "The Young Sound", an easy listening format focusing on instrumental versions of recent pop tunes, which aired on many of CBS's FM owned-and-operated stations.

By 1969, "The Young Sound" had evolved to an automated Top 40/AOR hybrid format, with voice tracked announcements by Dick Provost.

In late 1972, WEEI-FM flipped to adult contemporary, then evolved into its famous "Soft Rock" format in 1977, which remained in place until 1983.

By 1981, all of the other owned-and-operated CBS FM radio stations were carrying the "Hot Hits" format, supervised by programmer Mike Joseph, except for WCBS-FM in New York City.

In 2001, Little Walter's Time Machine was replaced with the Boston-based syndicated show The Lost 45s, the program's host Barry Scott stayed with the station until WODS's final day, when he became the first to be hired away by long-time rival WROR-FM.

When new Program Director Jon Zellner arrived in 2004, the station was focusing on 1964 to 1979 with just a handful of pre-1964 oldies and early ‘80s songs mixed in.

Over the years, WODS produced numerous free summer concerts starting at the steps of Boston City Hall Plaza in 1988 before moving to the larger Hatch Memorial Shell in May 1996.

The final concert lineup during the summer of 2012 included Jefferson Starship, Burton Cummings (of The Guess Who) and Rick Springfield.

Within hours of the announcement, the air staff was laid off and the station began to run jockless, with recorded liners thanking loyal listeners of WODS and advising them that "Boston's Greatest Hits" would move to its HD2 subchannel.

One of the now-unemployed DJs, Paula Street (who had been with WODS since February 1988), confirmed on the Radio-Info Boston message board [1] that a goodbye show for the format would happen before the flip at Noon.

[13] On February 2, 2017, CBS Radio announced it would merge with Entercom (which locally owned WEEI, WEEI-FM, WRKO, WKAF, and WAAF).

[14] WODS, WBMX, WEEI-AM-FM and WAAF were retained by Entercom, while sister stations WBZ and WZLX, as well as WKAF and WRKO, were spun off to iHeartMedia (WBZ-FM was then traded to Beasley Broadcast Group in exchange for WMJX).

"Producer Matt" Shearer from The TJ Show temporarily anchored mornings for the remainder of the top 40 format's run.

At 10:00 a.m. on May 28, 2020, after playing "Happier" by Marshmello and Bastille, WODS flipped to adult hits, branded as "Big 103, Music Unleashed".