Inclusion criteria (stroke patients)  Age < 80 Mini Mental State Examination > 24 Modified Rankin Scale: 1-3 Single hemisphere lesion Stabilized disease (> 6 months after the acute event) Impairment in gait parameters (e.g. velocity, perceived fatigue etc) Motor independence during walking (without orthotic devices and aids) but with pathological pattern (spasticity level: Ashworth < 2)  Inclusion criteria (patients with Parkinson's disease)  Age < 80 Mini Mental State Examination > 24 Unified Parkinson Disease Rating Scale score (Parte III): < 28 Stabilized disease and drug therapy Altered gait patterns Motor independence during walking (without orthotic devices and aids) but with pathological pattern  Inclusion criteria (patients with multiple sclerosis):  Age < 60 Mini Mental State Examination > 24 Expanded Disability Status Scale score: 3-5 Stabilized disease in the last 6 months (without relapse or disability progression) Altered gait patterns (i.e., careening, slowing down, spasticity: Ashworth < 2, etc.) Motor independence during walking  Exclusion Criteria (stroke patients)  Multiple or bilateral lesions Neglect Equinism Spasticity: Ashworth >2 Structured (non-elastic) Achilles tendon retraction Neurotoxin in the 3 months prior to the study Baclofen introduced or modified in the week before the start of the study Previous or concurrent diseases disabling the lower limb functions Rehabilitative treatments with music in the year before the study  Exclusion criteria (patients with Parkinson's disease):  Previous or concurrent diseases disabling the lower limb functions Changes of drug therapy during the study Rehabilitative treatments with music in the year before the study  Exclusion criteria (patients with multiple sclerosis):  Previous or concurrent diseases disabling the lower limb functions Neurotoxin in the 3 months prior to the study Baclofen introduced or modified in the week before the start of the study Spasticity: Ashworth >2 Structured (non-elastic) Achilles tendon retraction Rehabilitative treatments with music in the year before the study