Your Micromax Canvas Spark 4-G is equipped with a microSD memory card reader. If your laptop or personal computer can also read that kind of card (Most laptop computers are so-equipped), you should be able to transfer music files
The Micromax Canvas Spark 4G is an Android smartphone and the Android market offers a bunch of free ringtone apps such as MP3 Ringtone Maker, Myxer and more.
Learn more about making your own free ringtones
Here is a sample of the all free ringtones (compatible with your Micromax Canvas Spark 4G) we offer:
Free 'Unclassified' Ringtones Free Ghost Ringtones Free Short Ringtones Free Techno Ringtones Hear All Our Free Polyphonic Ringtones