Although sometimes criticized for a repetitive and apparently simple guitar riff sequence and harmonies on many of their numbers, their musical versatility can be heard in some of their earlier or less well-known numbers, such as Ice in the Sun, Pictures of Matchstick Men and Forty-Five Hundred Times. The latter probably highlights, more than any other, Rossi and Parfitt's talent for close vocal and guitar harmonies, which owe much to the English folk and folk/rock genres. Whether intentional or not this has become their hallmark.