File Permissions - Ubuntu Server

[Simon Ives]

I'm running Ubuntu Server 8.04 and I need to change the permissions for
a large quantity of files and directories.

I've got a directory named 'music' that I share with the home network.
This includes other Linux boxes that access this directory via nfs and
some Windows XP boxes accessing it via samba.  I've just transferred
around 80gb of music files and directories from a Windows drive and I
need a command to alter the permissions of all the files as read/write
for everyone.

Further, is there a way that I can set all newly created directories and
files within this particular directory to inherit the file permissions
of the parent directory?

Thanks.

Simon Ives.