Who sang the songs for each of the Schoolhouse Rock clips?

1. Schoolhouse Rocky - Bob Dorough And Friend
2. Elementary, My Dear - Bob Dorough
3. Three Is A Magic Number - Bob Dorough
4. The Four-Legged Zoo - Bob Dorough And Friends
5. Ready Or Not, Here I Come - Bob Dorough
6. My Hero, Zero - Bob Dorough
7. I Got Six - Grady Tate
8. Lucky Seven Sampson - Bob Dorough
9. Figure Eight - Blossom Dearie
10. Naughty Number Nine - Grady Tate
11. The Good Eleven - Bob Dorough
12. Little Twelvetoes - Bob Dorough
13. My Hero, Zero - The Lemonheads
Disc: 2
1. Schoolhouse Rocky - Bob Dorough And Friend
2. Unpack Your Adjectives - Blossom Deari
3. Lolly, Lolly, Lolly, Get Your Adverbs Here - Bob Dorough
4. Conjuntion Junction - Jack Sheldon- Terry More
5. Interjections - Essra Mohaw
6. Rufus Xavier Sarsaparilla - Jack Sheldo
7. Verb: That's What's Happening - Zachary Sander
8. A Noun Is A Person, Place Or Thing - Lynn Ahrens
9. Busy Prepositions - Bob Dorough- Jack Sheldo
10. The Tale Of Mr. Morton - Jack Sheldo
11. Dollars And Sense - Val Hawk - Bob Dorough
12. Tax Man Max - Patrick Quinn
13. $7.50 Once A Week - Dave Frishberg
14. Where The Money Goes - Jack Sheldo
Disc: 3
1. Schoolhouse Rocky - Bob Dorough And Friend
2. No More Kings - Lynn Ahrens
3. Fireworks - Grady Tat
4. The Shot Heard 'Round The World - Bob Dorough
5. The Preamble - Lynn Ahrens
6. Elbow Room - Sue Manchester
7. The Great American Melting Pot - Lori Lieberma
8. Mother Necessity - B.Dorough-B.Dearie-E.Mohawk-J.Sheldon
9. Sufferin' Till Suffrage - Essra Mohawk And Friends
10. I'm Just A Bill - Jack Sheldo
11. Three-Ring Government - Lynn Ahrens
12. Electricity, Electricity - Sung By Goodnes
Disc: 4
1. Schoolhouse Rocky - Bob Dorough And Friends
2. The Body Machine - Bob Dorough - Jack Sheldo
3. Do The Circulation - J. Armstead-M. Barry-M. Stewar
4. Electricity, Electricity - Zachary Sander
5. The Energy Blues - Jack Sheldo
6. Interplanet Janet - Lynn Ahrens
7. Telegraph Line - Jaime Aff - Christine Langne
8. Them Not-So-Dry Bones - Jack Sheldo
9. A Victim Of Gravity - Sung By The Token
10. Introduction - Darrell Stern-Bob Kaliban
11. Software - Darrell Stern - Bob Kaliba
12. Hardware - Darrell Stern - Bob Kaliba
13. Number Cruncher - Darrell Stern - Bob Kaliba

Source: http://www.amazon.com/Schoolhouse-Rock-1973-Various-Artists/dp/samples/B0000033TA/ref=dp_tracks_all_1/105-5608164-7666847#disc_1

The two most recognized voices of the series were Jack Sheldon (most remembered for I'm Just a Bill) and Bob Dorough.