were do i find music online ???

hello there guys !! 
i am new to this ,, and i rescently powered up my first stereo sound system that i was bulding for 6 months now ,, my source is my mac, and  i use a benchmark dac 3 pre amp ,, but i don’t know were to play music from , i have downloaded tidal , but i didn’t hear the quality i was expecting 
any other sourses to enjoy music from my mac ? 
thanks