WCRB (99.5 FM) is a non-commercial radio station licensed to Lowell, Massachusetts, which serves the Greater Boston area.

WCRB programming is simulcast on the second HD Radio channel of WGBH, allowing WCRB to reach some portions of the Boston area that cannot receive 99.5, and on two other stations: WJMF, in Smithfield, Rhode Island, serving nearby Providence and the second HD Radio channel of WCAI, in Woods Hole.

Jones decided to change WCRB's format from that of a typical suburban AM station of the era to full-time classical music.

[2] Station WCRB and H. H. Scott, then of Maynard, Massachusetts, developed prototype stereophonic equipment that was used to prove the General Electric multiplex method being evaluated by the Federal Communications Commission (FCC).

It was the first radio station to obtain a permanent waiver of the FCC rules requiring average modulation in excess of eighty-five percent.

To them, as long as the frequency response and noise level matched their specifications, stereo simply meant that there would be two lines.

In 1978, Charles River Broadcasting sold off WHET (later renamed WRCA), but retained WCRB, which became increasingly successful over the years as a 24/7 classical music station.

However, the decision to interpret the commitment as a request rather than a demand resulted in the announced sale of the station to Greater Media on December 19, 2005.

This, and the sales of stations such as WCRQ in Providence, Rhode Island, marked the beginning of the gradual dissolution of the Theodore Jones trust.

Speculation arose that Greater Media would sell off 99.5 WKLB-FM, as its Andover transmitter location provided poor overall coverage of the Boston market, in contrast to the company's other stations.

At the same time, Greater Media announced that the country format and intellectual property of WKLB would relocate to the prime signal of 102.5 MHz.

[6] WJMF began carrying WCRB programming in September 2011, since the frequency change in 2006, Providence had been one of the largest markets without access to a full-time classical music station.

In 1982, WSSH evolved to a soft AC format gradually eliminating the instrumental renditions, and became home to popular nighttime radio personality Delilah Rene before she became nationally syndicated.

Greater Media noted that the move was made because the 99.5 signal is stronger than that of 96.9 in Essex County, home to many country music listeners.

An FM station of WCRB's power transmitting on 102.5 MHz could reach parts of Worcester, Massachusetts, Providence, Rhode Island; and Southeastern New Hampshire.

If the WCRB programming did in fact reach half a million people, it would generate a rating of close to 12 per cent of the market.

[15] WCRB engineers worked with Bell Telephone to develop frequency and phase matching technology for using pairs of 15 kHz leased lines throughout the country to carry stereo signals for studio to transmitter links and improved geographical coverage of broadcast signals (leased-line technology has since been replaced by microwave links, satellite feeds, and high-quality transmission using the Internet).

They were also at the center of the development of modern multiplexed FM stereo technology and its approval by the FCC, in cooperation with FM receiver manufacturer H. H. Scott, Inc. WCRB was formerly carried on a separately-owned translator in Manchester, New Hampshire, W295BL (106.9); this ended after the translator was sold by Basic Holdings to Saga Communications in September 2019.