Australian rockers Icehouse are celebrating four decades with two new catalogue pieces on CD and vinyl, out this month. Led by singer Iva Davies, Icehouse racked up 18 Top 40 hits in their native land, including “Love in Motion,” “Great Southern Land,” “Hey Little Girl” and “Crazy.” Their sole chart-topper in Australia was also their only Top 10 hit in the United States: the stellar pop single “Electric Blue,” written by Davies with Icehouse fan John Oates. Davies still leads the group on stage; a double live album, In Concert, was issued…