1. **State the problem:** We need to find the sum of all the credits listed in the recordings. 2. **List all credits:** The credits are: 2.87, 3.07, 3.26, 2.76, 3.15, 2.95, 3.15, 2.56, 2.70, 2.97, 2.79, 3.28, 2.70, 2.15, 3.02, 2.97, 2.84, 2.81, 2.90, 2.95, 3.65, 3.61, 3.68, 3.65, 2.83, 3.47, 2.95, 3.50, 3.05, 3.32, 3.09, 2.95, 3.16, 3.00, 3.02, 3.28, 3.32, 3.11, 3.14, 2.81, 3.37, 2.97, 2.83, 3.14, 3.54, 3.40, 3.15, 2.98, 3.40, 3.21, 3.42, 3.28, 3.00, 3.23, 3.40, 3.29, 3.51, 3.91, 3.29, 3.75, 3.64, 3.05, 4.07, 4.14, 4.10, 4.10, 4.09, 5.35, 4.19, 4.19, 4.16, 4.19, 4.12, 4.19, 4.16, 4.16, 4.16, 4.19, 4.17, 4.21, 4.19, 4.16, 1.19, 4.16, 4.13, 4.17, 5.35, 4.19, 4.14, 4.16, 4.16, 4.13, 4.14, 4.14, 4.12, 4.14, 4.09, 4.09, 4.10, 4.12. 3. **Sum the credits:** $$\text{Sum} = 2.87 + 3.07 + 3.26 + 2.76 + 3.15 + 2.95 + 3.15 + 2.56 + 2.70 + 2.97 + 2.79 + 3.28 + 2.70 + 2.15 + 3.02 + 2.97 + 2.84 + 2.81 + 2.90 + 2.95 + 3.65 + 3.61 + 3.68 + 3.65 + 2.83 + 3.47 + 2.95 + 3.50 + 3.05 + 3.32 + 3.09 + 2.95 + 3.16 + 3.00 + 3.02 + 3.28 + 3.32 + 3.11 + 3.14 + 2.81 + 3.37 + 2.97 + 2.83 + 3.14 + 3.54 + 3.40 + 3.15 + 2.98 + 3.40 + 3.21 + 3.42 + 3.28 + 3.00 + 3.23 + 3.40 + 3.29 + 3.51 + 3.91 + 3.29 + 3.75 + 3.64 + 3.05 + 4.07 + 4.14 + 4.10 + 4.10 + 4.09 + 5.35 + 4.19 + 4.19 + 4.16 + 4.19 + 4.12 + 4.19 + 4.16 + 4.16 + 4.16 + 4.19 + 4.17 + 4.21 + 4.19 + 4.16 + 1.19 + 4.16 + 4.13 + 4.17 + 5.35 + 4.19 + 4.14 + 4.16 + 4.16 + 4.13 + 4.14 + 4.14 + 4.12 + 4.14 + 4.09 + 4.09 + 4.10 + 4.12$$ 4. **Calculate the total:** $$\text{Sum} = 345.88$$ 5. **Answer:** The total sum of the credits is **345.88**.