The two groups  in terms of their connection are;
- Garth Brooks,  Bill Monroe, Bill Keith, and Alison Krauss- Bluegrass  Music
- Bela Fleck, David Grisman, Charley Pride, and Earl Scruggs -Plays banjo or Dobro.
What is the musical connection about?
Garth Brooks,  Bill Monroe, Bill Keith, and Alison Krauss are all known to be very famous in Bluegrass  Music.
Bill Keith was known for his mark left behind on bluegrass as he plays scales and chromatic passages. 
 Bela Fleck, David Grisman, Charley Pride, and Earl Scruggs  are very famous as they Plays banjo or Dobro.
 Earl Scruggs  is known for producing the banjo as the key instrument in blue-grass music.
Therefore, The two groups  in terms of their connection are;
- Garth Brooks,  Bill Monroe, Bill Keith, and Alison Krauss- Bluegrass  Music
- Bela Fleck, David Grisman, Charley Pride, and Earl Scruggs -Plays banjo or Dobro.
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