Cindy should have a strong alto and a sweet sounding mix.
Low F. Belt to B-flat. Easy mix to D.

Sings sweetly (Where The Boys Are, End of the World, Walk On By) But also in a low range (These Boots Are Made For Walkin')
Should be able to belt out Town Without Pity (to B flat) Her Act One Finale Solo (I Don't Wanna Be A Loser) goes from a sweet wistful soft ballad to a big belt finish.

Marge should have a strong, controlled pop/rock belt, Tough R&B 'wail', Plus nice mix for backup.

Solos include: "You Don't Have To Say You Love Me" (Dusty Springfield) Belt to C#, "Respect" (Aretha Franklin) R&B to F, "Our Day Will Come" Nice mix to C.

Strong pop alto with a strong belt. Plus nice mix for back up.

Solos include: "I Will Follow Him" (Low G to D. Belt or strong mix), "Today I Met The Boy" (Belt or strong mix to E flat).