But in practice though it is quite expensive to build up a personal library of music, whereas services like googles provide you with a vast catalog (Googles, I

But in practice though it is quite expensive to build up a personal library of music, whereas services like googles provide you with a vast catalog (Googles, I find is quite comprehensive, I haven't checked other services) at a small fixed cost. Its like buying a book and renting it out of a library, for some books it may make sense to buy, where as for very many others it is better to rent.