Premature infants are a highly prevalent and vulnerable group in paediatric care, and face several short- and long-term challenges. Research on brain development in premature infants demonstrates a high incidence of white and grey matter abnormalities and neurobehavioral delay, as well as an increased risk of brain injury. There is growing awareness that premature infants need individualized nurturing interactions with their caregivers while they are in a neonatal intensive care unit (NICU) to support healthy development and prevent future difficulties. One particular intervention that may have considerable potential in the NICU is creative music therapy (CMT), an individualized, interactive, resource- and needs-oriented music therapy approach. Results demonstrate that CMT can facilitate relaxation and stabilization in premature infants; by experiencing inter-subjectivity through music, the infants can be empowered to engage in meaningful and nurturing interactions (Haslbeck, 2013 a,b) .

Several researchers (Als, 2012; Trevarthen, 2008; Schore, 2003) have described how interactive and multi-sensory experiences of the fetus particularly facilitate brain development and learning about socio-emotional figures, respectively, in prematurely born infants. It is assumed that positive auditory experiences can promote premature infants' early brain maturation and contribute to their healthy neurodevelopment (Xu et al., 2009). Studies in music and neuroscience have demonstrated that music promotes neurobiological processes and modulates synaptic plasticity, neuronal learning and readjustment in the human brain (Rickard et al., 2005). The individualized approach in active music therapy may especially activate brain structures involved in emotional, sensorimotor and cognitive processing (Koelsch, 2009; Fachner et al., 2012).

Since, on one hand, individualized interactive experiences and, on the other hand, music may alter brain development in the fetus and very young infants, the question arises as to whether CMT might actually promote a premature infant's brain development by facilitating nurturing socio-emotional and auditory interactive experiences at the same time. Therefore a randomized, controlled, clinical trial will be conducted. 30 premature infants receive CMT during their hospitalization time and 30 premature infants without music therapy serves as control group. The primary objective is to explore if the experience of CMT in premature infants improves their brain growth and development at 38-42 weeks of corrected gestational age. The main secondary objective is to explore if CMT improves the neurobehavioral outcomes of premature infants at 9 and 24 months, as well as at 5 years of age. Magnetic resonance imaging is used to evaluate the infants' cerebral cortical development and myelination. Electroencephalography (EEG) is used to evaluate the infants' brain function and maturation. Insights into possible long-term and sustainable outcomes will be gained via neuro-developmental follow-up examinations. It is hypothesized that the experience of CMT in neonatal care improves both short- and long-term neurological outcomes. We expect that the experimental group will demonstrate superior brain growth and development at 38-42 weeks of corrected gestational age as well as improved cognitive, behavioral and motor developmental outcomes later on. This paper will introduce first insights and preliminary results of the ongoing study. Strategies and challenges inherent in conducting a controlled clinical trial within this vulnerable group will be discussed.