HD	Huntington’s disease
PD	Parkinson’s disease
RAS	Rhythmic auditory stimulation
MoCA	Montreal Cognitive Assessment
UHDRS-TMS	Unified Huntington’s Disease Rating Scale Total Motor Score
BESTest	Balance Evaluation Systems Test
MUSIC	externally based cue of music being played aloud
SING	internally generated cueing of participants singing aloud
PRE	baseline, uncued walking trials
DT	cognitive dual-task trials
POST	final, uncued walking trials
CV	coefficient of variation
ABC	Activities-Specific Balance Confidence Scale
T-MoCA	Telephone MoCA