Sefirat HaOmer-

We start counting the Omer, from the second night of Pesach until the day before Shabuot. We say the Sefirah at night, right when three stars come out. If one missed Sefirah, he says it in the morning without a bracha. If one missed Sefirah at night, and in the day, he should continue to say sefirah, but from then on "Bracha Baruch Ata A-d-o-n-a-i E-l-o-h-e-n-u Melekh HaOlam Asher Kideshanu BeMitzvotav Vetzivanu Al Sefirat HaOmer", then you say the day I.E- 16 days, you say 2 weeks, and 2 days to the Omer.It is customary not to shave, and no haircuts are the basics. The main problem is listening to music- According to someAshkenaz, if you can dance to the music you are not allowed to listen. According to some Sephardim, one may not listen if there is instruments.