At firsst, you had to use a browser, but thanks to Google Music Player this is no longer necessary.
What this program does is convert Google Music into an desktop application that has a separate window.
From this window you can navegate through your collection that is stored in Google Music.
Besides being to minimize the window for Google Music, at the left uppper hand corner, you have the tools to record music. This way you do not have to reopen the program's window.
All this makes Google Music Player a highly recommendable application for those who have already began to use the online streaming service from Google Music.