The present invention relates to new and/or improved methods of identificationand selection of cardiomyocytes from human embryonic stem (hES) cells. The methodfurther comprises isolating the selected cardiomyocyte population. Thereis also provided method for the screening for cardiovascular compounds comprisingsubjecting the said cardiomyocyte population to test compound/s, and observingand/or interpreting a response of the cardiomyocytes to the test compound.