UnScramble this Word: o r i s e c w?

Questions

Grateful Dead:April Fools, Barney pretended to play bass, but this man was backstage playing.?

Grateful Dead:Former Tubes member who is now GD keyboardist.?

Grateful Dead:She lost her sparkle you know she isn't the same.?

Grateful Dead:This man drove his train while under the influence of an illegal substance.?

Grateful Dead:This song, their first top 40 hit, came 20 years into their careers.?