RIDGEFIELD — Ridgefield choir teacher Bobbe Whetsell had to think outside of the box to teach students online. Of course, it was impossible to hold a normal concert. After initially only teaching music history, notation and other nonperformance topics, students were able to record some vocal parts, but they still couldn’t do it all together. But then Whetsell had an idea to compile dozens of student videos into a virtual concert for each of her five classes. “I’m not really good at technology, so it took me a long time,” Whetsell said in a news release. She spent more than 40 hours editing and compiling the videos. She emailed the videos to students and parents so they could have a virtual concert viewing together. “I wanted to honor the work that they put in and show them what it sounds like together,” Whetsell said.