Ideas:
1) Determine nextURL on our own; don't wait for spotify API call to give it to us
2) put the results of each spotify api call into an array where each result is a promise; then we can loop through the array and add in tracks where the promise is resolved.
Ideas: 1) Determine nextURL on our own; don't wait for spotify API call to give it to us 2) put the results of each spotify api call into an array where each result is a promise; then we can loop through the array and add in tracks where the promise is resolved.