If the methods above seem a little too tedious, you can use third-party apps to combine songs into one TikTok video. CapCut is free, and a lot of big-name TikTok creators love it. InShot is another great application that lets you combine two songs for a TikTok video. Create your sounds in the third-party app, save it to your phone, then you can upload it on TikTok.