My shallow hills are the faces of kings my horizon is always near my music sends men to the grave my absence sends men to work. what am i?

riddle me, riddle me ranty ro my father gave me seeds to sow the seed was black and the ground was white if you riddle me that you’ll escape my bite. i am the unreachable boundary, yet the place you wish to go, i run away as you approach. but i am always there. what am i?

at night i come without being fetched, and by day i am lost without being stolen. i am like a diamond, but i am no jewel what am i?