The ukulele has somehow become strongly associated with generic, lighthearted stock music used for contemporary video production. Although stock music can be a very good and cost-friendly solution for explainer videos, it often risks sounding generic and may not align with the emotional tone and narrative of your animation.
When using stock music, accept that music research takes time and effort. You need a systematic process for browsing music libraries and testing multiple soundtracks to get it right. Go beyond the top 10 tracks and the usual suspects – and, please, no ukuleles!