Composing instrumental music for concentration at work, relaxing, etc.

For this project I need a music composer to compose several sounds and instrumental music which is good for concentration - the music shall be composed by you and respect copyright laws - so please do not send music that is not of you - please send me in advance short samples of your music you have composed before - the total length of music shall be approx 60minutes - the budget for this project is USD 250 - the project shall be finished within 1-2 weeks - thx for bidding