Final answer:
The claim that Music Assisted Relaxation is the best and most used intervention in palliative care by music therapists is false, as there are various individualized interventions used depending on patient needs.
Step-by-step explanation:
The claim that Music Assisted Relaxation (MAR) is the best and most used intervention in palliative care by music therapists is false. While MAR is indeed a valuable and commonly used modality within music therapy in palliative care, there isn't a consensus on a single 'best' intervention, as effectiveness can be highly individualized depending on the patient's needs, preferences, and context. Music therapy interventions are diverse and may include active engagement in music-making, receptive listening, songwriting, and palliative performance, among others.