Aly and AJ Michalka are making magic on the road while they tour as special guests with Ben Platt. The sisters and singing duo spoke to ET's Denny Directo and opened up about what makes their synergy so palpable.«I think this collaboration, being able to tour with Ben, has been really special because his fan base is very, very in line with the way our fans think and view music,» AJ tells ET.