It's all right now, baby it's all right now.. .

Who sang this gem?

I believe that you are referring to "All Right Now (http://www.youtube.com/watch?v=d_BeacO2POk)".

Performer: Rod Stewart
Composer: Paul Rodgers
Lyricist: Paul Rodgers

I am pretty sure the band was "Free". The other answer may be correct too, but they were a band.

Here's a link to some info about the group that originally recorded it:

BAD COMPANY BIOGRAPHY (http://www.sing365.com/music/lyric.nsf/Bad-Company-Biography/CE5054EEFE2F70C6482569FF0013B5C1)

Here's their lyrics:

Bad Company - All Right Now LYRICS (http://www.lyricsdownload.com/bad-company-all-right-now-lyrics.html)

A Band called Free, who later some members re formed as Bad Co.

There were a number of performers to this song. I just listed one of the familiar ones.