I tried this by reading this book pg(39)https://ccrma.stanford.edu/~ruviaro/texts/A_Gentle_Introduction_To_SuperCollider.pdf::
~firstMelody = Pbind(
\degree, Pseq([1,2,3,4,5], inf),
~secondMelody = Pbind(
\degree, Pseq([5,4,3,2,1], inf),
~player1 = ~firstMelody.play;
~player2 = ~secondMelody.play;
//what’s in the pdfbook works , but what i did does not work.why if I did the same thing but simpler?