I've noticed that many Chinese people would use 个（個）instead of the proper classifier for many situations in daily conversations (e.g. 一个歌, rather than 一首歌).
Based on my current knowledge, 个（個）may be used in daily conversations occasionally for simplicity. However, are there any contexts where using 个（個）would be odd/improper? In business meetings, academic conferences, or when speaking to academics/professors, or even in certain situations in daily life, for example.
Thank you! Please feel free to include any literature on this or a similar topic, if available.