useless trivia: What Word Means: Impelled?

Questions

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?

Group stripped of a Grammy for not doing much more than posing for the cover?

Group: Richard Thompson, Sandy Denny, Simon Nicol..?