[DaveBlake]

Thanks @black_eagle error 1242 is indeeed a "more than 1 row returned" issue, and that makes me even more eager to get my hands on the data. 

Thanks @ntropy but unfortunately the file only contains structure and I need the data. In Heidi database export facility there is a drop down for data, pick "INSERT" and try again, or I am advised by my friend that from command line you can use

mysqldump -u <username> -p --databases MyMusic72 > MyDatabase.sql