The .m4a extension stands for MPEG-4 Audio , a container often associated with Apple's AAC codec.
While there isn't a single universal record for this specific filename, Likely Content 01 WestkГјste m4a
If your device doesn't support M4A, you can convert it to MP3 using the Apple Music App or online tools like HappyScribe . 01 WestkГјste m4a