Well, I don't think it'll be much but, if you like listening to music for fun and want to make some money, there's a website called Slicethepie referal link/ non-referal link basically what you do is you put some basic info (name, race, dob) and they use your general area to make sure you live in the U.S (but it seems to be expanding more) and what kinds of song genre's you like to listen to.
My wife has a few apps on her phone that allow her to do surveys at stores and they put money into her PayPal account. There has been a few months that she has made 100$ + or -, she has even received reimbursements for groceries she had to purchase as part of the survey. SurveyMini gets you gift cards, there is also easy shift and field agent, hope this helps.
$4 PER HOUR???/ there is NO way this is possible please show us your math for this! unless something has changed drastically those 6 apps from SB are capped at earnings that MIGHT get you a total of 60 CENTS a day - and engagemeTV is limited to 3 devices - and you MIGHT make 50 CENTS to $1 PER DAY on some of the BETTER sites than SB - is this that new common core math you are doing????