First recorded by Rod Stewart (1982).
Hit version by Dionne Warwick, Elton John, Stevie Wonder & Gladys Knight (US #1/R&B #1/UK #16/CAN #1/AUS #1 1985).
From the wiki: “‘That’s What Friends Are For’ was written by Burt Bacharach and Carole Bayer Sager (‘Everchanging Times‘) and was first recorded in 1982 by Rod Stewart for the soundtrack of the film Night Shift. The Dionne Warwick cover was a one-off collaboration featuring Warwick, Gladys Knight, Elton John and Stevie Wonder, which was released as a charity single in the US and UK to benefit the American Foundation for AIDS Research. Sales from the song raised over US$3 million for that cause.”
Dionne Warwick & Friends, “That’s What Friends Are For” (1985):