Who sang the 70's soul song called "Check it Out"?  It was I think mid
70's and definitely was a black band.  The only line I can remember is
"Check it out, baby...."

Dear suesings,

I believe that the group you are referring to is the Tavares. In 1974,
this black band produced a song named “Check It Out.” Please refer to
the site below. It has a complete “discography” on the Tavares.
 
Disco Funk and Old School Jams
http://www.discofresh.com/artists/tavares.html

If you would like to buy their album, Check It Out, please click on
the link below. It is available for $41.99. In the album, the song
“Check It Out” is the fourth track.

Amazon
http://www.amazon.com/exec/obidos/tg/stores/detail/-/music/B00004WH0N/qid%3D979340539/sr%3D1-8/104-5426146-8135947

For complete lyrics to the song, visit the following site.  

Song Lyrics
http://www.geocities.com/SunsetStrip/Venue/9769/rb/c/check_it_out.html

Notice that the phrases “baby, check it out” and “check it out, girl”
are mentioned.

My search stategy:

Of course, I used Google, my favorite search engine, and typed the
following.

 "Check it out" Tavares lyrics
://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&q=%22Check+it+out%22+Tavares+lyrics&btnG=Google+Search

"Check it out" soul song
://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=%22Check+it+out%22+soul+song&btnG=Google+Search

I hope that this is the band that you were referring to. Thanks for
the question!

Best regards,

ukiguy

There was also a version of "Check It Out" which was recorded by "The
Friends of Distinction" in the early '70s. You can listen to a brief
audio clip here:

http://cdnow.com/cgi-bin/mserver/SID=144944726/pagename=/RP/CDN/FIND/album.html/ArtistID=FRIENDS+OF+DISTINCTION/ITEMID=380086