The 1.7.5 client has been randomly playing the minecart sound at loud volume briefly upon entry into single player or multi player worlds. This is not always happening, but it is happening often enough to be annoying.
I had not noticed this happening before the 1.7.5 update.
Is this still a concern in the current Minecraft version 14w18b / Launcher version 1.3.11 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.