....CCR for short. This song of theirs came out during the days the Vietnam war and years later it has been used in many films and TV series as stated here . I quote from thw Wilkipidia.
....A version of the song, sung by JuJu Stulbach, rearranged and produced by Friesbie's P.T. Walkley, Scott Hollingsworth and Mary Wood, appears in "Clouds", a Traktor-directed commercial for General Electric.
...."Have You Ever Seen the Rain?" was played in "Look Again", the first episode of the TV series Cold Case......It was played for a montage in the Stargate SG-1 series finale, "Unending". This was the only time a popular song had been featured in the program.
.....This song was played in the film Evan Almighty (during the opening sequence).
.....It is featured in the both The Longest Yard and its remake of the same name.
.....In the film December Boys, it is heard in both the CCR version and a quieter instrumental version.
.....It was played at the end of an episode of TV series Magnum P.I.
.....In late 1993 "Have You Ever Seen the Rain?" is covered by Spin Doctors for the film Philadelphia.
....."Have You Ever Seen the Rain?" is the title of Season 2 premiere of the TV series Las Vegas. However, the episode does not feature the song.
....."Have You Ever Seen the Rain" played several times in the television series Dexter Season 1, Episode 9: "Father Knows Best".
.....A cover version by Joan Jett was played in the second season finale of The Wire: "Port in a Storm".
.....The song is in the credits of the French film, JCVD.
.....This song is in the movie Invincible'