From the description on You Tube:
Dionne's Promises Promises was a big international hit released in October 1968 prior to the December opening of the Neil Simon/Burt Bacharach/Hal David Broadway smash Promises, Promises in December 1968. Bacharach wanted to generate as much buzz for the musical and Dionne's Promises, Promises was released about two months prior to the opening of the show. The strategy paid off and in addition gave Dionne six chart hits in 1968 alone, peaking at #19 on Billboard's Hot 100 Singles Chart, #15 on the CashBox Top 100 Singles Chart, #17 on the Record World Top 40, and #8 on the Canadian Top 10. Promises, Promises turned out to be the show's most difficult number to sing,according to Serene Dominic, as its rapid fire melody left many singers short of breath. To Dionne, the tune was a piece of cake. It was her recording of the tune that proved the ideal vocal guide for the show's male lead, the late, great Jerry Orbach (a heck of a Broadway singer, he also portrayed Det. Lennie Briscoe on TV's Law and Order). Orbach attended Dionne's recording session at A&R Studios in Manhattan in September 1968 and reportedly asked Dionne, "How the hell do you sing this?" He took an acetate of Dionne's session to help him navigate the tune. The flip side of Dionne's Promises Promises single released by Scepter was also from the show. "Whoever You Are I Love You", a showstopper and one of the most hauntingly beautiful tunes in the show, but the subject matter (the female lead attempts suicide after her lover abandons her), alluded to in the tune's piano coda, which rendered Dionne's superlative recording of the song a little too desolate to make the Promises, Promises single a double sided hit. This was one of many, many tunes recorded at A & R Studios in Manhattan and engineered by the legendary Phil Ramone (producer of Billy Joel, etc.)