A short meditation at these times allows one to throw off some of the accumulated stress of the work-day and become rejuvenated for further activity. An important consideration is when your schedule will allow you to meditate. Having a time of the day set aside for meditation helps in maintaining regularity. Also, some people find meditation relatively easy but find that the hard thing is to actually get themselves to sit down and start their meditation. Music can help make this easier.
Some people use music quite often while others prefer silent meditation and never use it.
Different traditions give different answers. Opening your eyes may be distracting. Or try with the eyes open halfway or a bit more, the gaze unfocussed and directed downward, but keeping the head erect with the chin slightly tucked in. Whether focussed or unfocussed, the gaze should be relaxed in order to prevent eyestrain or headache. Experiment and see what works for you and then stick with your choice of technique.