This paper offers a solution to the issue of transparency in harmony systems.  In keeping with much previous work, it argues that the least marked state is that in which all segments in the domain of harmony agree in the harmonizing feature.  Domain-internal disagreement in feature values is possible only when motivated by markedness. As the abstract structure producing harmony is a domain rather than an autosegmental unit, violability of harmonic association is available. Thus, this account proposes that 'skipping' is permitted when motivated by other factors.  The analysis is set within Span Theory (McCarthy 2004) and formally captures the pattern by allowing violability of association with span heads via the ASSOCIATEHEAD family of constraints.