There are many programs available for remixing music. Some can be downloaded for Free, while others may be paid. Here are some examples:

Audacity: It is a free audio editing program. It offers many effects and filters, and you can cut and combine music.
FL Studio: It is a paid music production program.
It offers tools for editing, recording, mixing and mastering.
Ableton Live: It is a paid music production program. It is designed for live performances and offers many tools for remixing music.
Virtual DJ: It is a DJ software with free and paid versions. You can play music, remix it and add effects.
Serato DJ Pro: It is a paid DJ software. It offers features for remixing music and is compatible with most DJ equipment.
You can remix music using one of these programs. However, respect the music rights| It is recommended that you check the license of the music you will remix, in order to show it and not infringe copyrights.