Well, obviously there's different kinds of Music Boxes. The classic kind is the one you need to wind up, or even keep going for it to make any sound. These never play by themselves, but are quite sturdy. The original music boxes only 'knew' one song, later models could be 'fed' different tunes.
In downloading music, I am using this tool ct-download/internet-music-downloader/ it can download from different websites easily and fast
It really depends on which genera you look in. In some you may find more love songs, while you might find break up/sad songs in another.
You can get easily on google search.
Free download for free of the best break up songs can be found on itunes, psmp3 and freemp3whale. You can also check such sites as mp3round, top40.about, last.fm and spotify also have free downloads for the best break up songs.
One can find different types of family songs by looking at the different playlists created on YouTube that are titled Songs for the Family or Family Songs.
beemp3.com
They probably have different settings for different songs.
Break out
The Kill-30 Seconds To Mars
He was taking a break and started writing songs for other celebrites. :)
Some favorable songs by Taio Cruz are Dynamite and Break Your Heart.
You can find free music transposing software online, such as MuseScore or TuxGuitar, which can help you change the key of your songs easily.